NOAA SWPC Alerts, Watches and Warnings

The National Oceanic and Atmospheric Administration Space Weather Prediction Center (NOAA SWPC) is the official space weather government agency from the United States that provides alerts, watches and warning for space weather disturbances. Below you will find the latest space weather alerts, watches and warnings issued by the NOAA SWPC.

Thursday, 4 December 2025

21:29 UTC

Space Weather Message Code: WATA20
Serial Number: 1079
Issue Time: 2025 Dec 04 2129 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Dec 05: None (Below G1) Dec 06: None (Below G1) Dec 07: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

13:21 UTC

Space Weather Message Code: WARK04
Serial Number: 5173
Issue Time: 2025 Dec 04 1321 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5172
Valid From: 2025 Dec 03 1022 UTC
Now Valid Until: 2025 Dec 05 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

11:58 UTC

Space Weather Message Code: WARK05
Serial Number: 2147
Issue Time: 2025 Dec 04 1158 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2146
Valid From: 2025 Dec 03 1425 UTC
Now Valid Until: 2025 Dec 05 0000 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

09:00 UTC

Space Weather Message Code: ALTTP4
Serial Number: 697
Issue Time: 2025 Dec 04 0900 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Dec 04 0832 UTC



Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

08:55 UTC

Space Weather Message Code: ALTK05
Serial Number: 1925
Issue Time: 2025 Dec 04 0855 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Dec 04 0852 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

04:53 UTC

Space Weather Message Code: ALTK05
Serial Number: 1924
Issue Time: 2025 Dec 04 0453 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Dec 04 0445 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

03:08 UTC

Space Weather Message Code: SUMXM5
Serial Number: 300
Issue Time: 2025 Dec 04 0308 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2025 Dec 04 0236 UTC
Maximum Time: 2025 Dec 04 0250 UTC
End Time: 2025 Dec 04 0259 UTC
X-ray Class: M6.0
Optical Class: na
Location: N07E50
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

03:03 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1450
Issue Time: 2025 Dec 04 0303 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 04 0246 UTC
Estimated Velocity: 345 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

02:53 UTC

Space Weather Message Code: ALTK05
Serial Number: 1923
Issue Time: 2025 Dec 04 0253 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Dec 04 0247 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

02:50 UTC

Space Weather Message Code: ALTXMF
Serial Number: 503
Issue Time: 2025 Dec 04 0250 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Dec 04 0248 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

Wednesday, 3 December 2025

23:56 UTC

Space Weather Message Code: WARK05
Serial Number: 2146
Issue Time: 2025 Dec 03 2356 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2145
Valid From: 2025 Dec 03 1425 UTC
Now Valid Until: 2025 Dec 04 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

23:55 UTC

Space Weather Message Code: WARK04
Serial Number: 5172
Issue Time: 2025 Dec 03 2355 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5171
Valid From: 2025 Dec 03 1022 UTC
Now Valid Until: 2025 Dec 04 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

22:38 UTC

Space Weather Message Code: ALTK05
Serial Number: 1922
Issue Time: 2025 Dec 03 2238 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Dec 03 2215 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

20:48 UTC

Space Weather Message Code: ALTK07
Serial Number: 200
Issue Time: 2025 Dec 03 2048 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2025 Dec 03 2031 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

20:27 UTC

Space Weather Message Code: WARK07
Serial Number: 139
Issue Time: 2025 Dec 03 2027 UTC

WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2025 Dec 03 2025 UTC
Valid To: 2025 Dec 03 2359 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

19:58 UTC

Space Weather Message Code: ALTK06
Serial Number: 677
Issue Time: 2025 Dec 03 1958 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Dec 03 1959 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

19:53 UTC

Space Weather Message Code: WARK06
Serial Number: 627
Issue Time: 2025 Dec 03 1953 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Dec 03 1952 UTC
Valid To: 2025 Dec 03 2359 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

19:41 UTC

Space Weather Message Code: ALTK05
Serial Number: 1921
Issue Time: 2025 Dec 03 1941 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Dec 03 1941 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

14:52 UTC

Space Weather Message Code: ALTK05
Serial Number: 1920
Issue Time: 2025 Dec 03 1452 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Dec 03 1443 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

14:25 UTC

Space Weather Message Code: WARK05
Serial Number: 2145
Issue Time: 2025 Dec 03 1425 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Dec 03 1425 UTC
Valid To: 2025 Dec 04 0000 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

14:23 UTC

Space Weather Message Code: ALTK04
Serial Number: 2612
Issue Time: 2025 Dec 03 1423 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Dec 03 1419 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

10:22 UTC

Space Weather Message Code: WARK04
Serial Number: 5171
Issue Time: 2025 Dec 03 1022 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 03 1022 UTC
Valid To: 2025 Dec 03 2359 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

07:06 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3570
Issue Time: 2025 Dec 03 0706 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3569
Begin Time: 2025 Nov 25 1450 UTC
Yesterday Maximum 2MeV Flux: 8535 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Tuesday, 2 December 2025

05:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3569
Issue Time: 2025 Dec 02 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3568
Begin Time: 2025 Nov 25 1450 UTC
Yesterday Maximum 2MeV Flux: 8521 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Monday, 1 December 2025

21:19 UTC

Space Weather Message Code: WATA30
Serial Number: 262
Issue Time: 2025 Dec 01 2119 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Dec 02: None (Below G1) Dec 03: G2 (Moderate) Dec 04: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: There is a chance geomagnetic storming could reach G3 (Moderate) levels late 03 Dec, into early 04 Dec.

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

04:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3568
Issue Time: 2025 Dec 01 0459 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3567
Begin Time: 2025 Nov 25 1450 UTC
Yesterday Maximum 2MeV Flux: 8310 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

04:03 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1449
Issue Time: 2025 Dec 01 0403 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 01 0319 UTC
Estimated Velocity: 490 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

03:14 UTC

Space Weather Message Code: SUMX01
Serial Number: 203
Issue Time: 2025 Dec 01 0314 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2025 Dec 01 0227 UTC
Maximum Time: 2025 Dec 01 0249 UTC
End Time: 2025 Dec 01 0305 UTC
X-ray Class: X1.9
Location: N22E85
NOAA Scale: R3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

02:56 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1448
Issue Time: 2025 Dec 01 0256 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 01 0243 UTC
Estimated Velocity: 988 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

02:41 UTC

Space Weather Message Code: ALTXMF
Serial Number: 502
Issue Time: 2025 Dec 01 0241 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Dec 01 0240 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

01:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 2611
Issue Time: 2025 Dec 01 0101 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Dec 01 0100 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

00:54 UTC

Space Weather Message Code: WARK04
Serial Number: 5170
Issue Time: 2025 Dec 01 0054 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 01 0053 UTC
Valid To: 2025 Dec 01 1200 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Sunday, 30 November 2025

04:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3567
Issue Time: 2025 Nov 30 0459 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3566
Begin Time: 2025 Nov 25 1450 UTC
Yesterday Maximum 2MeV Flux: 23005 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Saturday, 29 November 2025

23:55 UTC

Space Weather Message Code: WARK04
Serial Number: 5169
Issue Time: 2025 Nov 29 2355 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5168
Valid From: 2025 Nov 24 0226 UTC
Now Valid Until: 2025 Nov 30 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

20:57 UTC

Space Weather Message Code: SUM10R
Serial Number: 891
Issue Time: 2025 Nov 29 2057 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Nov 29 2011 UTC
Maximum Time: 2025 Nov 29 2012 UTC
End Time: 2025 Nov 29 2013 UTC
Duration: 2 minutes
Peak Flux: 170 sfu
Latest Penticton Noon Flux: 160 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

11:58 UTC

Space Weather Message Code: WARK04
Serial Number: 5168
Issue Time: 2025 Nov 29 1158 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5167
Valid From: 2025 Nov 24 0226 UTC
Now Valid Until: 2025 Nov 29 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3566
Issue Time: 2025 Nov 29 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3565
Begin Time: 2025 Nov 25 1450 UTC
Yesterday Maximum 2MeV Flux: 14759 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

02:00 UTC

Space Weather Message Code: SUM10R
Serial Number: 890
Issue Time: 2025 Nov 29 0200 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Nov 29 0143 UTC
Maximum Time: 2025 Nov 29 0143 UTC
End Time: 2025 Nov 29 0143 UTC
Duration: 1 minutes
Peak Flux: 140 sfu
Latest Penticton Noon Flux: 138 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

Friday, 28 November 2025

22:47 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1447
Issue Time: 2025 Nov 28 2247 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Nov 28 2223 UTC
Estimated Velocity: 828 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

22:46 UTC

Space Weather Message Code: SUMXM5
Serial Number: 299
Issue Time: 2025 Nov 28 2246 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2025 Nov 28 2211 UTC
Maximum Time: 2025 Nov 28 2222 UTC
End Time: 2025 Nov 28 2224 UTC
X-ray Class: M5.9
Location: S16E80
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

22:35 UTC

Space Weather Message Code: SUM10R
Serial Number: 889
Issue Time: 2025 Nov 28 2235 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Nov 28 2220 UTC
Maximum Time: 2025 Nov 28 2221 UTC
End Time: 2025 Nov 28 2221 UTC
Duration: 1 minutes
Peak Flux: 240 sfu
Latest Penticton Noon Flux: 120 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

22:24 UTC

Space Weather Message Code: ALTXMF
Serial Number: 501
Issue Time: 2025 Nov 28 2224 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Nov 28 2222 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

17:20 UTC

Space Weather Message Code: WARK04
Serial Number: 5167
Issue Time: 2025 Nov 28 1720 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5166
Valid From: 2025 Nov 24 0226 UTC
Now Valid Until: 2025 Nov 29 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

08:58 UTC

Space Weather Message Code: WARK04
Serial Number: 5166
Issue Time: 2025 Nov 28 0858 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5165
Valid From: 2025 Nov 24 0226 UTC
Now Valid Until: 2025 Nov 28 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

04:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3565
Issue Time: 2025 Nov 28 0459 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3564
Begin Time: 2025 Nov 25 1450 UTC
Yesterday Maximum 2MeV Flux: 8297 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Thursday, 27 November 2025

21:18 UTC

Space Weather Message Code: WARK04
Serial Number: 5165
Issue Time: 2025 Nov 27 2118 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5164
Valid From: 2025 Nov 24 0226 UTC
Now Valid Until: 2025 Nov 28 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

21:11 UTC

Space Weather Message Code: ALTK05
Serial Number: 1919
Issue Time: 2025 Nov 27 2111 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 27 2055 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

21:09 UTC

Space Weather Message Code: WARK05
Serial Number: 2144
Issue Time: 2025 Nov 27 2109 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2143
Valid From: 2025 Nov 27 1108 UTC
Now Valid Until: 2025 Nov 28 0900 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

12:05 UTC

Space Weather Message Code: ALTK05
Serial Number: 1918
Issue Time: 2025 Nov 27 1205 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 27 1159 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

11:10 UTC

Space Weather Message Code: WARK05
Serial Number: 2143
Issue Time: 2025 Nov 27 1110 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Nov 27 1108 UTC
Valid To: 2025 Nov 27 1800 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

11:09 UTC

Space Weather Message Code: WARK04
Serial Number: 5164
Issue Time: 2025 Nov 27 1109 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5163
Valid From: 2025 Nov 24 0226 UTC
Now Valid Until: 2025 Nov 27 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

10:38 UTC

Space Weather Message Code: WARK04
Serial Number: 5163
Issue Time: 2025 Nov 27 1038 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5162
Valid From: 2025 Nov 24 0226 UTC
Now Valid Until: 2025 Nov 27 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3564
Issue Time: 2025 Nov 27 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3563
Begin Time: 2025 Nov 25 1450 UTC
Yesterday Maximum 2MeV Flux: 10064 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Wednesday, 26 November 2025

23:22 UTC

Space Weather Message Code: WARK04
Serial Number: 5162
Issue Time: 2025 Nov 26 2322 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5161
Valid From: 2025 Nov 24 0226 UTC
Now Valid Until: 2025 Nov 27 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

10:45 UTC

Space Weather Message Code: WARK04
Serial Number: 5161
Issue Time: 2025 Nov 26 1045 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5160
Valid From: 2025 Nov 24 0226 UTC
Now Valid Until: 2025 Nov 26 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

05:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3563
Issue Time: 2025 Nov 26 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3562
Begin Time: 2025 Nov 25 1450 UTC
Yesterday Maximum 2MeV Flux: 3722 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

00:39 UTC

Space Weather Message Code: WATA20
Serial Number: 1078
Issue Time: 2025 Nov 26 0039 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Nov 26: G1 (Minor) Nov 27: G1 (Minor) Nov 28: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Tuesday, 25 November 2025

23:54 UTC

Space Weather Message Code: WARK04
Serial Number: 5160
Issue Time: 2025 Nov 25 2354 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5159
Valid From: 2025 Nov 24 0226 UTC
Now Valid Until: 2025 Nov 26 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

20:53 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1446
Issue Time: 2025 Nov 25 2053 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Nov 25 1950 UTC
Estimated Velocity: 1050 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

14:55 UTC

Space Weather Message Code: WARK05
Serial Number: 2142
Issue Time: 2025 Nov 25 1455 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2141
Valid From: 2025 Nov 25 0211 UTC
Now Valid Until: 2025 Nov 25 2100 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

14:51 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3562
Issue Time: 2025 Nov 25 1451 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Nov 25 1450 UTC
Station: GOES19




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

08:47 UTC

Space Weather Message Code: ALTK05
Serial Number: 1917
Issue Time: 2025 Nov 25 0847 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 25 0845 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

08:24 UTC

Space Weather Message Code: WARK05
Serial Number: 2141
Issue Time: 2025 Nov 25 0824 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2140
Valid From: 2025 Nov 25 0211 UTC
Now Valid Until: 2025 Nov 25 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

08:23 UTC

Space Weather Message Code: WARK04
Serial Number: 5159
Issue Time: 2025 Nov 25 0823 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5158
Valid From: 2025 Nov 24 0226 UTC
Now Valid Until: 2025 Nov 25 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

02:24 UTC

Space Weather Message Code: ALTK05
Serial Number: 1916
Issue Time: 2025 Nov 25 0224 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 25 0216 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

02:11 UTC

Space Weather Message Code: WARK05
Serial Number: 2140
Issue Time: 2025 Nov 25 0211 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Nov 25 0211 UTC
Valid To: 2025 Nov 25 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Monday, 24 November 2025

23:54 UTC

Space Weather Message Code: WARK04
Serial Number: 5158
Issue Time: 2025 Nov 24 2354 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5157
Valid From: 2025 Nov 24 0226 UTC
Now Valid Until: 2025 Nov 25 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

14:07 UTC

Space Weather Message Code: ALTK05
Serial Number: 1915
Issue Time: 2025 Nov 24 1407 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 24 1400 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

13:27 UTC

Space Weather Message Code: WARK05
Serial Number: 2139
Issue Time: 2025 Nov 24 1327 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Nov 24 1330 UTC
Valid To: 2025 Nov 24 2100 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

11:59 UTC

Space Weather Message Code: ALTK04
Serial Number: 2610
Issue Time: 2025 Nov 24 1159 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Nov 24 1159 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

02:27 UTC

Space Weather Message Code: WARK04
Serial Number: 5157
Issue Time: 2025 Nov 24 0227 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Nov 24 0226 UTC
Valid To: 2025 Nov 24 2359 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Sunday, 23 November 2025

18:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 2609
Issue Time: 2025 Nov 23 1801 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Nov 23 1759 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

17:08 UTC

Space Weather Message Code: WARK04
Serial Number: 5156
Issue Time: 2025 Nov 23 1708 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Nov 23 1708 UTC
Valid To: 2025 Nov 23 2359 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

16:50 UTC

Space Weather Message Code: WATA20
Serial Number: 1077
Issue Time: 2025 Nov 23 1650 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Nov 24: None (Below G1) Nov 25: G1 (Minor) Nov 26: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Thursday, 20 November 2025

23:29 UTC

Space Weather Message Code: WARK04
Serial Number: 5155
Issue Time: 2025 Nov 20 2329 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Nov 20 2327 UTC
Valid To: 2025 Nov 21 1200 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

16:54 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1445
Issue Time: 2025 Nov 20 1654 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Nov 20 1459 UTC
Estimated Velocity: 1196 km/s

Comment: end time: 1503 UTC.



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

10:46 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3561
Issue Time: 2025 Nov 20 1046 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3560
Begin Time: 2025 Nov 19 1310 UTC
Yesterday Maximum 2MeV Flux: 1438 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

00:59 UTC

Space Weather Message Code: ALTTP4
Serial Number: 696
Issue Time: 2025 Nov 20 0059 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Nov 20 0023 UTC



Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

Wednesday, 19 November 2025

22:35 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1444
Issue Time: 2025 Nov 19 2235 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Nov 19 2215 UTC
Estimated Velocity: 695 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

13:41 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3560
Issue Time: 2025 Nov 19 1341 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Nov 19 1310 UTC
Station: GOES19




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Monday, 17 November 2025

23:55 UTC

Space Weather Message Code: WARK04
Serial Number: 5154
Issue Time: 2025 Nov 17 2355 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5153
Valid From: 2025 Nov 15 2000 UTC
Now Valid Until: 2025 Nov 18 0600 UTC
Warning Condition: Persistence

Comment: WC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

10:47 UTC

Space Weather Message Code: WARK04
Serial Number: 5153
Issue Time: 2025 Nov 17 1047 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5152
Valid From: 2025 Nov 15 2000 UTC
Now Valid Until: 2025 Nov 17 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Sunday, 16 November 2025

22:17 UTC

Space Weather Message Code: WARK04
Serial Number: 5152
Issue Time: 2025 Nov 16 2217 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5151
Valid From: 2025 Nov 15 2000 UTC
Now Valid Until: 2025 Nov 17 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

03:03 UTC

Space Weather Message Code: ALTK04
Serial Number: 2608
Issue Time: 2025 Nov 16 0303 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Nov 16 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

02:19 UTC

Space Weather Message Code: WARK04
Serial Number: 5151
Issue Time: 2025 Nov 16 0219 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5150
Valid From: 2025 Nov 15 2000 UTC
Now Valid Until: 2025 Nov 16 2359 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Saturday, 15 November 2025

20:02 UTC

Space Weather Message Code: WARK04
Serial Number: 5150
Issue Time: 2025 Nov 15 2002 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Nov 15 2000 UTC
Valid To: 2025 Nov 16 0300 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Friday, 14 November 2025

23:38 UTC

Space Weather Message Code: SUMPX1
Serial Number: 126
Issue Time: 2025 Nov 14 2338 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2025 Nov 14 0920 UTC
Maximum Time: 2025 Nov 14 0950 UTC
End Time: 2025 Nov 14 1325 UTC
Maximum 10MeV Flux: 16 pfu
NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

17:50 UTC

Space Weather Message Code: WATA20
Serial Number: 1076
Issue Time: 2025 Nov 14 1750 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Nov 15: None (Below G1) Nov 16: G1 (Minor) Nov 17: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

12:09 UTC

Space Weather Message Code: SUM10R
Serial Number: 888
Issue Time: 2025 Nov 14 1209 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Nov 14 0822 UTC
Maximum Time: 2025 Nov 14 0825 UTC
End Time: 2025 Nov 14 0841 UTC
Duration: 19 minutes
Peak Flux: 1100 sfu
Latest Penticton Noon Flux: 156 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

11:45 UTC

Space Weather Message Code: ALTTP4
Serial Number: 695
Issue Time: 2025 Nov 14 1145 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Nov 14 0837 UTC



Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

09:37 UTC

Space Weather Message Code: ALTPX1
Serial Number: 361
Issue Time: 2025 Nov 14 0937 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2025 Nov 14 0920 UTC
NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

09:17 UTC

Space Weather Message Code: WARPX1
Serial Number: 616
Issue Time: 2025 Nov 14 0917 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2025 Nov 14 0917 UTC
Valid To: 2025 Nov 14 2359 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

09:08 UTC

Space Weather Message Code: SUMX01
Serial Number: 202
Issue Time: 2025 Nov 14 0908 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2025 Nov 14 0744 UTC
Maximum Time: 2025 Nov 14 0830 UTC
End Time: 2025 Nov 14 0840 UTC
X-ray Class: X4
Optical Class: na
Location: N24W68
NOAA Scale: R3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

08:41 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1443
Issue Time: 2025 Nov 14 0841 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Nov 14 0813 UTC
Estimated Velocity: 1525 km/s

Comment: From San Vito



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

08:26 UTC

Space Weather Message Code: ALTXMF
Serial Number: 500
Issue Time: 2025 Nov 14 0826 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Nov 14 0823 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

Thursday, 13 November 2025

21:11 UTC

Space Weather Message Code: SUMPX1
Serial Number: 125
Issue Time: 2025 Nov 13 2111 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2025 Nov 10 1030 UTC
Maximum Time: 2025 Nov 12 0215 UTC
End Time: 2025 Nov 13 2100 UTC
Maximum 10MeV Flux: 1456 pfu
NOAA Scale: S3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

20:58 UTC

Space Weather Message Code: WARK04
Serial Number: 5149
Issue Time: 2025 Nov 13 2058 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5148
Valid From: 2025 Nov 11 2230 UTC
Now Valid Until: 2025 Nov 14 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

20:56 UTC

Space Weather Message Code: WARK05
Serial Number: 2138
Issue Time: 2025 Nov 13 2056 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2137
Valid From: 2025 Nov 11 2343 UTC
Now Valid Until: 2025 Nov 14 0900 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

20:56 UTC

Space Weather Message Code: WARK06
Serial Number: 626
Issue Time: 2025 Nov 13 2056 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 625
Valid From: 2025 Nov 11 2344 UTC
Now Valid Until: 2025 Nov 14 0900 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

15:38 UTC

Space Weather Message Code: WATA50
Serial Number: 93
Issue Time: 2025 Nov 13 1538 UTC

WATCH: Geomagnetic Storm Category G3 Predicted

Highest Storm Level Predicted by Day:
Nov 13: G3 (Strong) Nov 14: G1 (Minor) Nov 15: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: Downgrading watch to G3 (Strong) for the remainder of 13 Nov as geomagnetic activity gradually subsides.

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

14:47 UTC

Space Weather Message Code: WARK06
Serial Number: 625
Issue Time: 2025 Nov 13 1447 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 624
Valid From: 2025 Nov 11 2344 UTC
Now Valid Until: 2025 Nov 13 2100 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

14:36 UTC

Space Weather Message Code: ALTK05
Serial Number: 1914
Issue Time: 2025 Nov 13 1436 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 13 1435 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

11:45 UTC

Space Weather Message Code: WARPX1
Serial Number: 615
Issue Time: 2025 Nov 13 1145 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 614
Valid From: 2025 Nov 10 1030 UTC
Now Valid Until: 2025 Nov 13 2100 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

07:32 UTC

Space Weather Message Code: ALTK06
Serial Number: 676
Issue Time: 2025 Nov 13 0732 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Nov 13 0723 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

07:32 UTC

Space Weather Message Code: WARK05
Serial Number: 2137
Issue Time: 2025 Nov 13 0732 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2136
Valid From: 2025 Nov 11 2343 UTC
Now Valid Until: 2025 Nov 13 2100 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

07:32 UTC

Space Weather Message Code: WARK06
Serial Number: 624
Issue Time: 2025 Nov 13 0732 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 623
Valid From: 2025 Nov 11 2344 UTC
Now Valid Until: 2025 Nov 13 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

07:04 UTC

Space Weather Message Code: ALTK05
Serial Number: 1913
Issue Time: 2025 Nov 13 0704 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 13 0647 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

06:03 UTC

Space Weather Message Code: SUMPC0
Serial Number: 38
Issue Time: 2025 Nov 13 0603 UTC

SUMMARY: Proton Event 100MeV Integral Flux exceeded 1pfu
Begin Time: 2025 Nov 11 1100 UTC
Maximum Time: 2025 Nov 12 0150 UTC
End Time: 2025 Nov 12 0925 UTC
Maximum 100MeV Flux: 37 pfu

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

06:00 UTC

Space Weather Message Code: SUMPX2
Serial Number: 58
Issue Time: 2025 Nov 13 0600 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2025 Nov 11 1225 UTC
Maximum Time: 2025 Nov 12 0215 UTC
End Time: 2025 Nov 13 0205 UTC
Maximum 10MeV Flux: 1460 pfu
NOAA Scale: S3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

05:23 UTC

Space Weather Message Code: ALTK07
Serial Number: 199
Issue Time: 2025 Nov 13 0523 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2025 Nov 13 0518 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

04:07 UTC

Space Weather Message Code: ALTK06
Serial Number: 675
Issue Time: 2025 Nov 13 0407 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Nov 13 0404 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

03:35 UTC

Space Weather Message Code: ALTK05
Serial Number: 1912
Issue Time: 2025 Nov 13 0335 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 13 0330 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

01:53 UTC

Space Weather Message Code: ALTK07
Serial Number: 198
Issue Time: 2025 Nov 13 0153 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2025 Nov 13 0150 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

01:21 UTC

Space Weather Message Code: ALTK06
Serial Number: 674
Issue Time: 2025 Nov 13 0121 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Nov 13 0116 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

00:30 UTC

Space Weather Message Code: ALTK05
Serial Number: 1911
Issue Time: 2025 Nov 13 0030 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 13 0025 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

00:03 UTC

Space Weather Message Code: ALTK05
Serial Number: 1910
Issue Time: 2025 Nov 13 0003 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 12 2359 UTC
Synoptic Period: 2100-0000 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Wednesday, 12 November 2025

23:56 UTC

Space Weather Message Code: WARPX1
Serial Number: 614
Issue Time: 2025 Nov 12 2356 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 613
Valid From: 2025 Nov 10 1030 UTC
Now Valid Until: 2025 Nov 13 1200 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

23:54 UTC

Space Weather Message Code: WARPC0
Serial Number: 120
Issue Time: 2025 Nov 12 2354 UTC

EXTENDED WARNING: Proton 100MeV Integral Flux above 1pfu expected
Extension to Serial Number: 119
Valid From: 2025 Nov 11 1028 UTC
Now Valid Until: 2025 Nov 13 0600 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.

23:38 UTC

Space Weather Message Code: SUMPX3
Serial Number: 21
Issue Time: 2025 Nov 12 2338 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 1000pfu
Begin Time: 2025 Nov 12 0145 UTC
Maximum Time: 2025 Nov 12 0215 UTC
End Time: 2025 Nov 12 0310 UTC
Maximum 10MeV Flux: 1460 pfu
NOAA Scale: S3 - Strong

Comment: Final CME shock appears to have arrived at L1 at approximately 12/1853 UTC. The corresponding proton enhancement in GEO reached 819 pfu at 12/1915 UTC. S3 levels are no longer expected.

WC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

20:54 UTC

Space Weather Message Code: WARK06
Serial Number: 623
Issue Time: 2025 Nov 12 2054 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 622
Valid From: 2025 Nov 11 2344 UTC
Now Valid Until: 2025 Nov 13 0900 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

20:54 UTC

Space Weather Message Code: WARK07
Serial Number: 138
Issue Time: 2025 Nov 12 2054 UTC

EXTENDED WARNING: Geomagnetic K-index of 7 or greater expected
Extension to Serial Number: 137
Valid From: 2025 Nov 12 0020 UTC
Now Valid Until: 2025 Nov 13 0900 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

20:52 UTC

Space Weather Message Code: ALTK06
Serial Number: 673
Issue Time: 2025 Nov 12 2052 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Nov 12 2051 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

20:11 UTC

Space Weather Message Code: ALTK05
Serial Number: 1909
Issue Time: 2025 Nov 12 2011 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 12 2009 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

19:38 UTC

Space Weather Message Code: SUMSUD
Serial Number: 291
Issue Time: 2025 Nov 12 1938 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2025 Nov 12 1917 UTC
Deviation: 33 nT
Station: FRD

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

19:04 UTC

Space Weather Message Code: WARSUD
Serial Number: 247
Issue Time: 2025 Nov 12 1904 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2025 Nov 12 1915 UTC
Valid To: 2025 Nov 12 1945 UTC
IP Shock Passage Observed: 2025 Nov 12 1853 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

18:05 UTC

Space Weather Message Code: WATA99
Serial Number: 12
Issue Time: 2025 Nov 12 1805 UTC

WATCH: Geomagnetic Storm Category G4 or Greater Predicted

Highest Storm Level Predicted by Day:
Nov 13: G4 (Severe) Nov 14: G1 (Minor) Nov 15: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.

17:36 UTC

Space Weather Message Code: ALTK05
Serial Number: 1908
Issue Time: 2025 Nov 12 1736 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 12 1719 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

12:51 UTC

Space Weather Message Code: ALTK05
Serial Number: 1907
Issue Time: 2025 Nov 12 1251 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 12 1240 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

11:51 UTC

Space Weather Message Code: WARPC0
Serial Number: 119
Issue Time: 2025 Nov 12 1151 UTC

EXTENDED WARNING: Proton 100MeV Integral Flux above 1pfu expected
Extension to Serial Number: 118
Valid From: 2025 Nov 11 1028 UTC
Now Valid Until: 2025 Nov 12 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.

10:38 UTC

Space Weather Message Code: ALTK07
Serial Number: 197
Issue Time: 2025 Nov 12 1038 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2025 Nov 12 1033 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

09:35 UTC

Space Weather Message Code: ALTK06
Serial Number: 672
Issue Time: 2025 Nov 12 0935 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Nov 12 0931 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

09:19 UTC

Space Weather Message Code: ALTK05
Serial Number: 1906
Issue Time: 2025 Nov 12 0919 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 12 0912 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

08:59 UTC

Space Weather Message Code: ALTK07
Serial Number: 196
Issue Time: 2025 Nov 12 0859 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2025 Nov 12 0859 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

08:37 UTC

Space Weather Message Code: WARK07
Serial Number: 137
Issue Time: 2025 Nov 12 0837 UTC

EXTENDED WARNING: Geomagnetic K-index of 7 or greater expected
Extension to Serial Number: 136
Valid From: 2025 Nov 12 0020 UTC
Now Valid Until: 2025 Nov 12 2100 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

08:37 UTC

Space Weather Message Code: WARK06
Serial Number: 622
Issue Time: 2025 Nov 12 0837 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 621
Valid From: 2025 Nov 11 2344 UTC
Now Valid Until: 2025 Nov 12 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

08:37 UTC

Space Weather Message Code: WARK05
Serial Number: 2136
Issue Time: 2025 Nov 12 0837 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2135
Valid From: 2025 Nov 11 2343 UTC
Now Valid Until: 2025 Nov 13 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

08:37 UTC

Space Weather Message Code: ALTK06
Serial Number: 671
Issue Time: 2025 Nov 12 0837 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Nov 12 0831 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

08:37 UTC

Space Weather Message Code: WARK04
Serial Number: 5148
Issue Time: 2025 Nov 12 0837 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5147
Valid From: 2025 Nov 11 2230 UTC
Now Valid Until: 2025 Nov 13 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

06:59 UTC

Space Weather Message Code: ALTK05
Serial Number: 1905
Issue Time: 2025 Nov 12 0659 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 12 0655 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:02 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3559
Issue Time: 2025 Nov 12 0502 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3558
Begin Time: 2025 Nov 10 1325 UTC
Yesterday Maximum 2MeV Flux: 10891 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

03:46 UTC

Space Weather Message Code: ALTK08
Serial Number: 54
Issue Time: 2025 Nov 12 0346 UTC

ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2025 Nov 12 0345 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G4 - Severe

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.

03:14 UTC

Space Weather Message Code: ALTK07
Serial Number: 195
Issue Time: 2025 Nov 12 0314 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2025 Nov 12 0310 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

03:11 UTC

Space Weather Message Code: ALTK06
Serial Number: 670
Issue Time: 2025 Nov 12 0311 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Nov 12 0306 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

03:10 UTC

Space Weather Message Code: ALTK05
Serial Number: 1904
Issue Time: 2025 Nov 12 0310 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 12 0305 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

01:55 UTC

Space Weather Message Code: ALTPX3
Serial Number: 33
Issue Time: 2025 Nov 12 0155 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 1000pfu
Begin Time: 2025 Nov 12 0145 UTC
NOAA Scale: S3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience increasing radiation exposures. Astronauts on EVA (extra-vehicular activity) are exposed to elevated radiation levels.
Spacecraft - Single-event upsets to satellite operations, noise in imaging systems, and slight reduction of efficiency in solar panels are likely.
Radio - Degraded or episodically blacked-out polar HF (high frequency) radio propagation.

01:22 UTC

Space Weather Message Code: ALTK08
Serial Number: 53
Issue Time: 2025 Nov 12 0122 UTC

ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2025 Nov 12 0121 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G4 - Severe

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.

00:45 UTC

Space Weather Message Code: ALTK07
Serial Number: 194
Issue Time: 2025 Nov 12 0045 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2025 Nov 12 0040 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

00:30 UTC

Space Weather Message Code: ALTK06
Serial Number: 669
Issue Time: 2025 Nov 12 0030 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Nov 12 0024 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

00:21 UTC

Space Weather Message Code: ALTK05
Serial Number: 1903
Issue Time: 2025 Nov 12 0021 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 12 0012 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

00:20 UTC

Space Weather Message Code: WARK07
Serial Number: 136
Issue Time: 2025 Nov 12 0020 UTC

WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2025 Nov 12 0020 UTC
Valid To: 2025 Nov 12 0900 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

00:19 UTC

Space Weather Message Code: ALTK04
Serial Number: 2607
Issue Time: 2025 Nov 12 0019 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Nov 12 0011 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Tuesday, 11 November 2025

23:45 UTC

Space Weather Message Code: WARK06
Serial Number: 621
Issue Time: 2025 Nov 11 2345 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Nov 11 2344 UTC
Valid To: 2025 Nov 12 1200 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

23:45 UTC

Space Weather Message Code: WARK05
Serial Number: 2135
Issue Time: 2025 Nov 11 2345 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Nov 11 2343 UTC
Valid To: 2025 Nov 12 2359 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

23:38 UTC

Space Weather Message Code: WARPC0
Serial Number: 118
Issue Time: 2025 Nov 11 2338 UTC

EXTENDED WARNING: Proton 100MeV Integral Flux above 1pfu expected
Extension to Serial Number: 117
Valid From: 2025 Nov 11 1028 UTC
Now Valid Until: 2025 Nov 12 1200 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.

23:38 UTC

Space Weather Message Code: WARPX1
Serial Number: 613
Issue Time: 2025 Nov 11 2338 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 612
Valid From: 2025 Nov 10 1030 UTC
Now Valid Until: 2025 Nov 12 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

23:16 UTC

Space Weather Message Code: SUMSUD
Serial Number: 290
Issue Time: 2025 Nov 11 2316 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2025 Nov 11 2300 UTC
Deviation: 17 nT
Station: BOU

Comment: Deviation of 17 nT observed at the Boulder magnetometer at 11/2300 UTC. This is likely the result of the first of three expected CME arrivals anticipated over approximately the next 17 to 18 hours.

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

22:28 UTC

Space Weather Message Code: WARK04
Serial Number: 5147
Issue Time: 2025 Nov 11 2228 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Nov 11 2230 UTC
Valid To: 2025 Nov 12 2359 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

22:28 UTC

Space Weather Message Code: WARSUD
Serial Number: 246
Issue Time: 2025 Nov 11 2228 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2025 Nov 11 2255 UTC
Valid To: 2025 Nov 11 2340 UTC
IP Shock Passage Observed: 2025 Nov 11 2212 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

17:05 UTC

Space Weather Message Code: WATA99
Serial Number: 11
Issue Time: 2025 Nov 11 1705 UTC

WATCH: Geomagnetic Storm Category G4 or Greater Predicted

Highest Storm Level Predicted by Day:
Nov 12: G4 (Severe) Nov 13: G3 (Strong) Nov 14: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.

12:32 UTC

Space Weather Message Code: ALTPX2
Serial Number: 79
Issue Time: 2025 Nov 11 1232 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2025 Nov 11 1232 UTC
NOAA Scale: S2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures.
Spacecraft - Infrequent single-event upsets to satellites are possible.
Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies.

12:30 UTC

Space Weather Message Code: SUM10R
Serial Number: 887
Issue Time: 2025 Nov 11 1230 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Nov 11 0959 UTC
Maximum Time: 2025 Nov 11 1002 UTC
End Time: 2025 Nov 11 1044 UTC
Duration: 45 minutes
Peak Flux: 10000 sfu
Latest Penticton Noon Flux: 180 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

11:56 UTC

Space Weather Message Code: WARPX1
Serial Number: 612
Issue Time: 2025 Nov 11 1156 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 611
Valid From: 2025 Nov 10 1030 UTC
Now Valid Until: 2025 Nov 12 1200 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

10:38 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1442
Issue Time: 2025 Nov 11 1038 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Nov 11 1001 UTC
Estimated Velocity: 1350 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

10:32 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3558
Issue Time: 2025 Nov 11 1032 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3557
Begin Time: 2025 Nov 10 1325 UTC
Yesterday Maximum 2MeV Flux: 4276 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

10:29 UTC

Space Weather Message Code: ALTPC0
Serial Number: 54
Issue Time: 2025 Nov 11 1029 UTC

ALERT: Proton Event 100MeV Integral Flux exceeded 1pfu
Begin Time: 2025 Nov 11 1029 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.

10:28 UTC

Space Weather Message Code: WARPC0
Serial Number: 117
Issue Time: 2025 Nov 11 1028 UTC

WARNING: Proton 100MeV Integral Flux above 1pfu expected
Valid From: 2025 Nov 11 1028 UTC
Valid To: 2025 Nov 11 2359 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.

10:23 UTC

Space Weather Message Code: SUMX01
Serial Number: 201
Issue Time: 2025 Nov 11 1023 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2025 Nov 11 0949 UTC
Maximum Time: 2025 Nov 11 1004 UTC
End Time: 2025 Nov 11 1017 UTC
X-ray Class: X5.1
Optical Class: 3b
Location: N28W12
NOAA Scale: R3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

10:02 UTC

Space Weather Message Code: ALTXMF
Serial Number: 499
Issue Time: 2025 Nov 11 1002 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Nov 11 1002 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

Monday, 10 November 2025

21:17 UTC

Space Weather Message Code: WATA50
Serial Number: 92
Issue Time: 2025 Nov 10 2117 UTC

WATCH: Geomagnetic Storm Category G3 Predicted

Highest Storm Level Predicted by Day:
Nov 11: G2 (Moderate) Nov 12: G3 (Strong) Nov 13: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

20:55 UTC

Space Weather Message Code: WARK04
Serial Number: 5146
Issue Time: 2025 Nov 10 2055 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5145
Valid From: 2025 Nov 10 1601 UTC
Now Valid Until: 2025 Nov 11 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

16:04 UTC

Space Weather Message Code: ALTK04
Serial Number: 2606
Issue Time: 2025 Nov 10 1604 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Nov 10 1604 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

16:01 UTC

Space Weather Message Code: WARK04
Serial Number: 5145
Issue Time: 2025 Nov 10 1601 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Nov 10 1601 UTC
Valid To: 2025 Nov 10 2100 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

13:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3557
Issue Time: 2025 Nov 10 1359 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Nov 10 1325 UTC
Station: GOES19




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

11:42 UTC

Space Weather Message Code: ALTPX1
Serial Number: 360
Issue Time: 2025 Nov 10 1142 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2025 Nov 10 1125 UTC
NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

10:23 UTC

Space Weather Message Code: SUMX01
Serial Number: 200
Issue Time: 2025 Nov 10 1023 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2025 Nov 10 0855 UTC
Maximum Time: 2025 Nov 10 0919 UTC
End Time: 2025 Nov 10 1018 UTC
X-ray Class: X1.2
Optical Class: 2b
Location: N28W01
NOAA Scale: R3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

10:18 UTC

Space Weather Message Code: WARPX1
Serial Number: 611
Issue Time: 2025 Nov 10 1018 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2025 Nov 10 1030 UTC
Valid To: 2025 Nov 11 1200 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

10:16 UTC

Space Weather Message Code: SUM10R
Serial Number: 886
Issue Time: 2025 Nov 10 1016 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Nov 10 0908 UTC
Maximum Time: 2025 Nov 10 0917 UTC
End Time: 2025 Nov 10 0943 UTC
Duration: 35 minutes
Peak Flux: 860 sfu
Latest Penticton Noon Flux: 176 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

10:01 UTC

Space Weather Message Code: ALTTP4
Serial Number: 694
Issue Time: 2025 Nov 10 1001 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Nov 10 0918 UTC



Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

09:46 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1441
Issue Time: 2025 Nov 10 0946 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Nov 10 0911 UTC
Estimated Velocity: 1321 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

09:13 UTC

Space Weather Message Code: ALTXMF
Serial Number: 498
Issue Time: 2025 Nov 10 0913 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Nov 10 0913 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

Sunday, 9 November 2025

18:21 UTC

Space Weather Message Code: WATA30
Serial Number: 261
Issue Time: 2025 Nov 09 1821 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Nov 10: G1 (Minor) Nov 11: G2 (Moderate) Nov 12: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

08:23 UTC

Space Weather Message Code: SUM10R
Serial Number: 885
Issue Time: 2025 Nov 09 0823 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Nov 09 0710 UTC
Maximum Time: 2025 Nov 09 0718 UTC
End Time: 2025 Nov 09 0735 UTC
Duration: 25 minutes
Peak Flux: 360 sfu
Latest Penticton Noon Flux: 172 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

08:04 UTC

Space Weather Message Code: SUMX01
Serial Number: 199
Issue Time: 2025 Nov 09 0804 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2025 Nov 09 0701 UTC
Maximum Time: 2025 Nov 09 0735 UTC
End Time: 2025 Nov 09 0755 UTC
X-ray Class: X1.7
Location: N23E01
NOAA Scale: R3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

07:51 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1440
Issue Time: 2025 Nov 09 0751 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Nov 09 0712 UTC
Estimated Velocity: 804 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

07:44 UTC

Space Weather Message Code: ALTTP4
Serial Number: 693
Issue Time: 2025 Nov 09 0744 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Nov 09 0719 UTC



Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

07:22 UTC

Space Weather Message Code: ALTXMF
Serial Number: 497
Issue Time: 2025 Nov 09 0722 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Nov 09 0719 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

Saturday, 8 November 2025

23:54 UTC

Space Weather Message Code: WARK04
Serial Number: 5144
Issue Time: 2025 Nov 08 2354 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5143
Valid From: 2025 Nov 05 0137 UTC
Now Valid Until: 2025 Nov 09 0900 UTC
Warning Condition: persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

07:51 UTC

Space Weather Message Code: ALTK05
Serial Number: 1902
Issue Time: 2025 Nov 08 0751 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 08 0737 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

06:12 UTC

Space Weather Message Code: ALTTP4
Serial Number: 692
Issue Time: 2025 Nov 08 0612 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Nov 08 0448 UTC



Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

04:04 UTC

Space Weather Message Code: ALTK05
Serial Number: 1901
Issue Time: 2025 Nov 08 0404 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 08 0401 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

02:02 UTC

Space Weather Message Code: ALTK06
Serial Number: 668
Issue Time: 2025 Nov 08 0202 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Nov 08 0201 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

01:58 UTC

Space Weather Message Code: WARK06
Serial Number: 620
Issue Time: 2025 Nov 08 0158 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Nov 08 0158 UTC
Valid To: 2025 Nov 08 1800 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

01:38 UTC

Space Weather Message Code: ALTK05
Serial Number: 1900
Issue Time: 2025 Nov 08 0138 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 08 0135 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

01:28 UTC

Space Weather Message Code: WARK04
Serial Number: 5143
Issue Time: 2025 Nov 08 0128 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5142
Valid From: 2025 Nov 05 0137 UTC
Now Valid Until: 2025 Nov 08 2359 UTC
Warning Condition: persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

01:27 UTC

Space Weather Message Code: WARK05
Serial Number: 2134
Issue Time: 2025 Nov 08 0127 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Nov 08 0130 UTC
Valid To: 2025 Nov 08 2100 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Friday, 7 November 2025

19:30 UTC

Space Weather Message Code: WATA30
Serial Number: 260
Issue Time: 2025 Nov 07 1930 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Nov 08: G2 (Moderate) Nov 09: G1 (Minor) Nov 10: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

13:58 UTC

Space Weather Message Code: WARK05
Serial Number: 2133
Issue Time: 2025 Nov 07 1358 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2132
Valid From: 2025 Nov 06 2347 UTC
Now Valid Until: 2025 Nov 07 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

08:31 UTC

Space Weather Message Code: ALTTP4
Serial Number: 691
Issue Time: 2025 Nov 07 0831 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Nov 07 0732 UTC



Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

08:06 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1439
Issue Time: 2025 Nov 07 0806 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Nov 07 0737 UTC
Estimated Velocity: 1169 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

07:25 UTC

Space Weather Message Code: ALTK05
Serial Number: 1899
Issue Time: 2025 Nov 07 0725 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 07 0716 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:36 UTC

Space Weather Message Code: SUMSUD
Serial Number: 289
Issue Time: 2025 Nov 07 0536 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2025 Nov 07 0517 UTC
Deviation: 40 nT
Station: CNB

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

05:04 UTC

Space Weather Message Code: WARSUD
Serial Number: 245
Issue Time: 2025 Nov 07 0504 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2025 Nov 07 0505 UTC
Valid To: 2025 Nov 07 0545 UTC
IP Shock Passage Observed: 2025 Nov 07 0449 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

04:56 UTC

Space Weather Message Code: WARK06
Serial Number: 619
Issue Time: 2025 Nov 07 0456 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Nov 07 0457 UTC
Valid To: 2025 Nov 07 1500 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

04:54 UTC

Space Weather Message Code: ALTK05
Serial Number: 1898
Issue Time: 2025 Nov 07 0454 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 07 0448 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

02:56 UTC

Space Weather Message Code: WARK04
Serial Number: 5142
Issue Time: 2025 Nov 07 0256 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5141
Valid From: 2025 Nov 05 0137 UTC
Now Valid Until: 2025 Nov 08 0300 UTC
Warning Condition: persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

02:26 UTC

Space Weather Message Code: ALTK05
Serial Number: 1897
Issue Time: 2025 Nov 07 0226 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 07 0220 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

00:00 UTC

Space Weather Message Code: ALTK05
Serial Number: 1896
Issue Time: 2025 Nov 07 0000 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 06 2359 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Thursday, 6 November 2025

23:50 UTC

Space Weather Message Code: WARK05
Serial Number: 2132
Issue Time: 2025 Nov 06 2350 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Nov 06 2347 UTC
Valid To: 2025 Nov 07 1500 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

20:31 UTC

Space Weather Message Code: WATA50
Serial Number: 91
Issue Time: 2025 Nov 06 2031 UTC

WATCH: Geomagnetic Storm Category G3 Predicted

Highest Storm Level Predicted by Day:
Nov 07: G3 (Strong) Nov 08: G2 (Moderate) Nov 09: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

17:37 UTC

Space Weather Message Code: WARK04
Serial Number: 5141
Issue Time: 2025 Nov 06 1737 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5140
Valid From: 2025 Nov 05 0137 UTC
Now Valid Until: 2025 Nov 07 0300 UTC
Warning Condition: persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

08:10 UTC

Space Weather Message Code: ALTK06
Serial Number: 667
Issue Time: 2025 Nov 06 0810 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Nov 06 0809 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

06:37 UTC

Space Weather Message Code: ALTK05
Serial Number: 1895
Issue Time: 2025 Nov 06 0637 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 06 0636 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:36 UTC

Space Weather Message Code: ALTK07
Serial Number: 193
Issue Time: 2025 Nov 06 0536 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2025 Nov 06 0527 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

04:10 UTC

Space Weather Message Code: WARK06
Serial Number: 618
Issue Time: 2025 Nov 06 0410 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 617
Valid From: 2025 Nov 05 2200 UTC
Now Valid Until: 2025 Nov 06 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

04:08 UTC

Space Weather Message Code: WARK07
Serial Number: 135
Issue Time: 2025 Nov 06 0408 UTC

WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2025 Nov 06 0408 UTC
Valid To: 2025 Nov 06 1200 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

03:51 UTC

Space Weather Message Code: ALTK06
Serial Number: 666
Issue Time: 2025 Nov 06 0351 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Nov 06 0346 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

03:36 UTC

Space Weather Message Code: ALTK05
Serial Number: 1894
Issue Time: 2025 Nov 06 0336 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 06 0330 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

01:47 UTC

Space Weather Message Code: WARK05
Serial Number: 2131
Issue Time: 2025 Nov 06 0147 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2130
Valid From: 2025 Nov 05 1950 UTC
Now Valid Until: 2025 Nov 06 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

01:46 UTC

Space Weather Message Code: WARK04
Serial Number: 5140
Issue Time: 2025 Nov 06 0146 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5139
Valid From: 2025 Nov 05 0137 UTC
Now Valid Until: 2025 Nov 06 1800 UTC
Warning Condition: persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

01:24 UTC

Space Weather Message Code: ALTK05
Serial Number: 1893
Issue Time: 2025 Nov 06 0124 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 06 0121 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Wednesday, 5 November 2025

22:53 UTC

Space Weather Message Code: ALTK06
Serial Number: 665
Issue Time: 2025 Nov 05 2253 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Nov 05 2252 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

22:37 UTC

Space Weather Message Code: WARK04
Serial Number: 5139
Issue Time: 2025 Nov 05 2237 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5138
Valid From: 2025 Nov 05 0137 UTC
Now Valid Until: 2025 Nov 07 0000 UTC
Warning Condition: persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

22:29 UTC

Space Weather Message Code: WARK06
Serial Number: 617
Issue Time: 2025 Nov 05 2229 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Nov 05 2200 UTC
Valid To: 2025 Nov 06 0900 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

22:24 UTC

Space Weather Message Code: SUMXM5
Serial Number: 298
Issue Time: 2025 Nov 05 2224 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2025 Nov 05 2152 UTC
Maximum Time: 2025 Nov 05 2207 UTC
End Time: 2025 Nov 05 2216 UTC
X-ray Class: M8.6
Location: N24E45
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

22:21 UTC

Space Weather Message Code: ALTK05
Serial Number: 1892
Issue Time: 2025 Nov 05 2221 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 05 2214 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

22:21 UTC

Space Weather Message Code: SUM10R
Serial Number: 884
Issue Time: 2025 Nov 05 2221 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Nov 05 2201 UTC
Maximum Time: 2025 Nov 05 2201 UTC
End Time: 2025 Nov 05 2206 UTC
Duration: 5 minutes
Peak Flux: 180 sfu
Latest Penticton Noon Flux: 147 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

22:16 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1438
Issue Time: 2025 Nov 05 2216 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Nov 05 2159 UTC
Estimated Velocity: 1395 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

22:05 UTC

Space Weather Message Code: ALTXMF
Serial Number: 496
Issue Time: 2025 Nov 05 2205 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Nov 05 1103 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

20:16 UTC

Space Weather Message Code: ALTK05
Serial Number: 1891
Issue Time: 2025 Nov 05 2016 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Nov 05 2010 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

19:50 UTC

Space Weather Message Code: WARK05
Serial Number: 2130
Issue Time: 2025 Nov 05 1950 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Nov 05 1950 UTC
Valid To: 2025 Nov 06 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

19:40 UTC

Space Weather Message Code: ALTK04
Serial Number: 2605
Issue Time: 2025 Nov 05 1940 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Nov 05 1936 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

18:07 UTC

Space Weather Message Code: WATA50
Serial Number: 90
Issue Time: 2025 Nov 05 1807 UTC

WATCH: Geomagnetic Storm Category G3 Predicted

Highest Storm Level Predicted by Day:
Nov 06: G3 (Strong) Nov 07: G3 (Strong) Nov 08: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

17:56 UTC

Space Weather Message Code: WARK04
Serial Number: 5138
Issue Time: 2025 Nov 05 1756 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5137
Valid From: 2025 Nov 05 0137 UTC
Now Valid Until: 2025 Nov 06 0000 UTC
Warning Condition: persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

14:53 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3556
Issue Time: 2025 Nov 05 1453 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Nov 05 1445 UTC
Station: GOES19




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.