Rahvusliku Ookeani ja Atmosfääri Administratsiooni Kosmoseilma Ennustuskeskuse (NOAA SWPC). Teavitused, vaatlused ja hoiatused

USA Rahvusliku Ookeani ja Atmosfääri Administratsiooni Kosmoseilma Ennustuskeskus (NOAA SWPC) on ametlik kosmose ilma alane valitsusagentuur Ameerika Ühendriikides, kes annab teavitusi, jälgib ja hoiatab kosmosest tulevate häiringute korral. Allpool leiate viimased teavitused, vaatlused ja hoiatused mis on välja andnud Rahvusliku Ookeani ja Atmosfääri Administratsiooni Kosmoseilma Ennustuskeskus (NOAA SWPC).

pühapäev, 4 jaanuar 2026

22:07 UTC

Space Weather Message Code: WARK04
Serial Number: 5206
Issue Time: 2026 Jan 04 2207 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 04 2207 UTC
Valid To: 2026 Jan 05 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.

14:37 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3594
Issue Time: 2026 Jan 04 1437 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3593
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 1940 pfu



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

laupäev, 3 jaanuar 2026

13:48 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3593
Issue Time: 2026 Jan 03 1348 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3592
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 4197 pfu



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

00:07 UTC

Space Weather Message Code: ALTK05
Serial Number: 1936
Issue Time: 2026 Jan 03 0007 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 02 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.

reede, 2 jaanuar 2026

20:28 UTC

Space Weather Message Code: WARK06
Serial Number: 630
Issue Time: 2026 Jan 02 2028 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 Jan 02 2030 UTC
Valid To: 2026 Jan 03 0600 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.

19:44 UTC

Space Weather Message Code: WARK04
Serial Number: 5205
Issue Time: 2026 Jan 02 1944 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5204
Valid From: 2026 Jan 02 1435 UTC
Now Valid Until: 2026 Jan 03 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 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.

19:30 UTC

Space Weather Message Code: ALTK05
Serial Number: 1935
Issue Time: 2026 Jan 02 1930 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jan 02 1925 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.

19:21 UTC

Space Weather Message Code: WARK05
Serial Number: 2165
Issue Time: 2026 Jan 02 1921 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Jan 02 1920 UTC
Valid To: 2026 Jan 03 0600 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.

19:20 UTC

Space Weather Message Code: WARK04
Serial Number: 5204
Issue Time: 2026 Jan 02 1920 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5203
Valid From: 2026 Jan 02 1435 UTC
Now Valid Until: 2026 Jan 03 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.

19:10 UTC

Space Weather Message Code: ALTK04
Serial Number: 2619
Issue Time: 2026 Jan 02 1910 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Jan 02 1906 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.

17:01 UTC

Space Weather Message Code: WATA20
Serial Number: 1085
Issue Time: 2026 Jan 02 1701 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jan 02: G1 (Minor) Jan 03: G2 (Moderate) Jan 04: 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.

14:35 UTC

Space Weather Message Code: WARK04
Serial Number: 5203
Issue Time: 2026 Jan 02 1435 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 02 1435 UTC
Valid To: 2026 Jan 02 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.

12:21 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3592
Issue Time: 2026 Jan 02 1221 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3591
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 1919 pfu



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

05:23 UTC

Space Weather Message Code: ALTK04
Serial Number: 2618
Issue Time: 2026 Jan 02 0523 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Jan 02 0523 UTC
Synoptic Period: 0300-0600 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.

05:08 UTC

Space Weather Message Code: WARK04
Serial Number: 5202
Issue Time: 2026 Jan 02 0508 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 02 0508 UTC
Valid To: 2026 Jan 02 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.

03:22 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1462
Issue Time: 2026 Jan 02 0322 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 Jan 01 0256 UTC
Estimated Velocity: 314 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.

neljapäev, 1 jaanuar 2026

14:44 UTC

Space Weather Message Code: WARK04
Serial Number: 5201
Issue Time: 2026 Jan 01 1444 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 01 1444 UTC
Valid To: 2026 Jan 01 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.

08:43 UTC

Space Weather Message Code: WARK04
Serial Number: 5200
Issue Time: 2026 Jan 01 0843 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5199
Valid From: 2026 Jan 01 0430 UTC
Now Valid Until: 2026 Jan 01 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.

04:09 UTC

Space Weather Message Code: WARK04
Serial Number: 5199
Issue Time: 2026 Jan 01 0409 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 01 0430 UTC
Valid To: 2026 Jan 01 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 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.

kolmapäev, 31 detsember 2025

22:59 UTC

Space Weather Message Code: WATA30
Serial Number: 263
Issue Time: 2025 Dec 31 2259 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Jan 01: G1 (Minor) Jan 02: G1 (Minor) Jan 03: 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.

16:32 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3591
Issue Time: 2025 Dec 31 1632 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3590
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 5613 pfu

Comment: Electrons went over threshold at 31/1255 through 31/1530 UTC.



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

14:25 UTC

Space Weather Message Code: SUMXM5
Serial Number: 303
Issue Time: 2025 Dec 31 1425 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2025 Dec 31 1312 UTC
Maximum Time: 2025 Dec 31 1351 UTC
End Time: 2025 Dec 31 1411 UTC
X-ray Class: M7.1
Location: N24E19
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.

14:19 UTC

Space Weather Message Code: SUM10R
Serial Number: 898
Issue Time: 2025 Dec 31 1419 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Dec 31 1331 UTC
Maximum Time: 2025 Dec 31 1348 UTC
End Time: 2025 Dec 31 1353 UTC
Duration: 22 minutes
Peak Flux: 550 sfu
Latest Penticton Noon Flux: 182 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.

14:01 UTC

Space Weather Message Code: ALTTP4
Serial Number: 701
Issue Time: 2025 Dec 31 1401 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Dec 31 1342 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.

14:00 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1461
Issue Time: 2025 Dec 31 1400 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 31 1333 UTC
Estimated Velocity: 893 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.

13:44 UTC

Space Weather Message Code: ALTXMF
Serial Number: 507
Issue Time: 2025 Dec 31 1344 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Dec 31 1342 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.

13:36 UTC

Space Weather Message Code: WARK04
Serial Number: 5198
Issue Time: 2025 Dec 31 1336 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 31 1335 UTC
Valid To: 2025 Dec 31 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.

teisipäev, 30 detsember 2025

05:02 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3590
Issue Time: 2025 Dec 30 0502 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3589
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 6690 pfu



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

esmaspäev, 29 detsember 2025

15:42 UTC

Space Weather Message Code: WATA20
Serial Number: 1084
Issue Time: 2025 Dec 29 1542 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Dec 30: None (Below G1) Dec 31: None (Below G1) Jan 01: 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.

08:06 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3589
Issue Time: 2025 Dec 29 0806 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3588
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 8999 pfu



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

pühapäev, 28 detsember 2025

22:55 UTC

Space Weather Message Code: SUM10R
Serial Number: 897
Issue Time: 2025 Dec 28 2255 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Dec 28 2225 UTC
Maximum Time: 2025 Dec 28 2231 UTC
End Time: 2025 Dec 28 2236 UTC
Duration: 11 minutes
Peak Flux: 300 sfu
Latest Penticton Noon Flux: 188 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.

04:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3588
Issue Time: 2025 Dec 28 0459 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3587
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 6123 pfu



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

laupäev, 27 detsember 2025

05:07 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3587
Issue Time: 2025 Dec 27 0507 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3586
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 8195 pfu



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

03:24 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3586
Issue Time: 2025 Dec 27 0324 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3585
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 8195 pfu



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

02:15 UTC

Space Weather Message Code: SUMXM5
Serial Number: 302
Issue Time: 2025 Dec 27 0215 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2025 Dec 27 0138 UTC
Maximum Time: 2025 Dec 27 0150 UTC
End Time: 2025 Dec 27 0159 UTC
X-ray Class: M5.1
Location: S09E73
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.

02:04 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1460
Issue Time: 2025 Dec 27 0204 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 27 0147 UTC
Estimated Velocity: 788 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.

01:56 UTC

Space Weather Message Code: SUM10R
Serial Number: 896
Issue Time: 2025 Dec 27 0156 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Dec 27 0144 UTC
Maximum Time: 2025 Dec 27 0144 UTC
End Time: 2025 Dec 27 0146 UTC
Duration: 2 minutes
Peak Flux: 190 sfu
Latest Penticton Noon Flux: 166 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.

01:50 UTC

Space Weather Message Code: ALTXMF
Serial Number: 506
Issue Time: 2025 Dec 27 0150 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Dec 27 0148 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.

reede, 26 detsember 2025

05:12 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3585
Issue Time: 2025 Dec 26 0512 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3584
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 8651 pfu



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

neljapäev, 25 detsember 2025

05:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3584
Issue Time: 2025 Dec 25 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3583
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 7351 pfu



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

kolmapäev, 24 detsember 2025

20:52 UTC

Space Weather Message Code: WARK04
Serial Number: 5197
Issue Time: 2025 Dec 24 2052 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5196
Valid From: 2025 Dec 21 0240 UTC
Now Valid Until: 2025 Dec 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.

08:49 UTC

Space Weather Message Code: WARK05
Serial Number: 2164
Issue Time: 2025 Dec 24 0849 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2163
Valid From: 2025 Dec 22 1407 UTC
Now Valid Until: 2025 Dec 24 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 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.

08:48 UTC

Space Weather Message Code: WARK04
Serial Number: 5196
Issue Time: 2025 Dec 24 0848 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5195
Valid From: 2025 Dec 21 0240 UTC
Now Valid Until: 2025 Dec 24 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 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.

05:06 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3583
Issue Time: 2025 Dec 24 0506 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3582
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 5557 pfu



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

teisipäev, 23 detsember 2025

23:08 UTC

Space Weather Message Code: WARK05
Serial Number: 2163
Issue Time: 2025 Dec 23 2308 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2162
Valid From: 2025 Dec 22 1407 UTC
Now Valid Until: 2025 Dec 24 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.

23:07 UTC

Space Weather Message Code: WARK04
Serial Number: 5195
Issue Time: 2025 Dec 23 2307 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5194
Valid From: 2025 Dec 21 0240 UTC
Now Valid Until: 2025 Dec 24 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.

14:09 UTC

Space Weather Message Code: WARK05
Serial Number: 2162
Issue Time: 2025 Dec 23 1409 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2161
Valid From: 2025 Dec 22 1407 UTC
Now Valid Until: 2025 Dec 23 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.

09:02 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3582
Issue Time: 2025 Dec 23 0902 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3581
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 1882 pfu



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

05:55 UTC

Space Weather Message Code: WARK05
Serial Number: 2161
Issue Time: 2025 Dec 23 0555 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2160
Valid From: 2025 Dec 22 1407 UTC
Now Valid Until: 2025 Dec 23 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.

esmaspäev, 22 detsember 2025

23:54 UTC

Space Weather Message Code: WARK05
Serial Number: 2160
Issue Time: 2025 Dec 22 2354 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2159
Valid From: 2025 Dec 22 1407 UTC
Now Valid Until: 2025 Dec 23 0600 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.

17:55 UTC

Space Weather Message Code: WARK04
Serial Number: 5194
Issue Time: 2025 Dec 22 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5193
Valid From: 2025 Dec 21 0240 UTC
Now Valid Until: 2025 Dec 23 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.

15:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3581
Issue Time: 2025 Dec 22 1500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3580
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 1566 pfu



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

14:10 UTC

Space Weather Message Code: ALTK05
Serial Number: 1934
Issue Time: 2025 Dec 22 1410 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Dec 22 1410 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.

14:07 UTC

Space Weather Message Code: WARK05
Serial Number: 2159
Issue Time: 2025 Dec 22 1407 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Dec 22 1407 UTC
Valid To: 2025 Dec 22 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.

pühapäev, 21 detsember 2025

23:16 UTC

Space Weather Message Code: ALTK05
Serial Number: 1933
Issue Time: 2025 Dec 21 2316 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Dec 21 2314 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.

18:00 UTC

Space Weather Message Code: ALTK05
Serial Number: 1932
Issue Time: 2025 Dec 21 1800 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Dec 21 1759 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.

17:55 UTC

Space Weather Message Code: WARK04
Serial Number: 5193
Issue Time: 2025 Dec 21 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5192
Valid From: 2025 Dec 21 0240 UTC
Now Valid Until: 2025 Dec 22 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.

14:45 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3580
Issue Time: 2025 Dec 21 1445 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Dec 21 1425 UTC
Station: GOES19




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

13:50 UTC

Space Weather Message Code: WARK05
Serial Number: 2158
Issue Time: 2025 Dec 21 1350 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Dec 21 1400 UTC
Valid To: 2025 Dec 22 1200 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.

04:14 UTC

Space Weather Message Code: WARK04
Serial Number: 5192
Issue Time: 2025 Dec 21 0414 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5191
Valid From: 2025 Dec 21 0240 UTC
Now Valid Until: 2025 Dec 21 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.

03:04 UTC

Space Weather Message Code: ALTK04
Serial Number: 2617
Issue Time: 2025 Dec 21 0304 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Dec 21 0300 UTC
Synoptic Period: 0300-0600 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.

02:40 UTC

Space Weather Message Code: WARK04
Serial Number: 5191
Issue Time: 2025 Dec 21 0240 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 21 0240 UTC
Valid To: 2025 Dec 22 2359 UTC
Warning Condition: Onset

Comment: Onset of + CH HSS influence

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.

laupäev, 20 detsember 2025

12:36 UTC

Space Weather Message Code: WATA20
Serial Number: 1083
Issue Time: 2025 Dec 20 1236 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Dec 21: None (Below G1) Dec 22: G1 (Minor) Dec 23: 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.

08:09 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1459
Issue Time: 2025 Dec 20 0809 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 20 0759 UTC
Estimated Velocity: 558 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.

04:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3579
Issue Time: 2025 Dec 20 0459 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3578
Begin Time: 2025 Dec 17 1405 UTC
Yesterday Maximum 2MeV Flux: 3239 pfu



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

reede, 19 detsember 2025

07:56 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3578
Issue Time: 2025 Dec 19 0756 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3577
Begin Time: 2025 Dec 17 1405 UTC
Yesterday Maximum 2MeV Flux: 2694 pfu



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

neljapäev, 18 detsember 2025

23:14 UTC

Space Weather Message Code: WARK04
Serial Number: 5190
Issue Time: 2025 Dec 18 2314 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5189
Valid From: 2025 Dec 17 2044 UTC
Now Valid Until: 2025 Dec 19 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.

17:56 UTC

Space Weather Message Code: WARK04
Serial Number: 5189
Issue Time: 2025 Dec 18 1756 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5188
Valid From: 2025 Dec 17 2044 UTC
Now Valid Until: 2025 Dec 18 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.

11:06 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3577
Issue Time: 2025 Dec 18 1106 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3576
Begin Time: 2025 Dec 17 1405 UTC
Yesterday Maximum 2MeV Flux: 1632 pfu



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

05:57 UTC

Space Weather Message Code: WARK04
Serial Number: 5188
Issue Time: 2025 Dec 18 0557 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5187
Valid From: 2025 Dec 17 2044 UTC
Now Valid Until: 2025 Dec 18 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.

05:56 UTC

Space Weather Message Code: WARK05
Serial Number: 2157
Issue Time: 2025 Dec 18 0556 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2156
Valid From: 2025 Dec 17 2221 UTC
Now Valid Until: 2025 Dec 18 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.

03:18 UTC

Space Weather Message Code: WARK04
Serial Number: 5187
Issue Time: 2025 Dec 18 0318 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5186
Valid From: 2025 Dec 17 2044 UTC
Now Valid Until: 2025 Dec 18 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.

00:02 UTC

Space Weather Message Code: ALTK05
Serial Number: 1931
Issue Time: 2025 Dec 18 0002 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Dec 17 2330 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.

kolmapäev, 17 detsember 2025

22:21 UTC

Space Weather Message Code: WARK05
Serial Number: 2156
Issue Time: 2025 Dec 17 2221 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Dec 17 2221 UTC
Valid To: 2025 Dec 18 0600 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.

20:50 UTC

Space Weather Message Code: ALTK04
Serial Number: 2616
Issue Time: 2025 Dec 17 2050 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Dec 17 2050 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.

20:45 UTC

Space Weather Message Code: WARK04
Serial Number: 5186
Issue Time: 2025 Dec 17 2045 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 17 2044 UTC
Valid To: 2025 Dec 18 0600 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.

15:06 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3576
Issue Time: 2025 Dec 17 1506 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Dec 17 1405 UTC
Station: GOES19




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

00:04 UTC

Space Weather Message Code: WATA20
Serial Number: 1082
Issue Time: 2025 Dec 17 0004 UTC

CANCEL WATCH: Geomagnetic Storm Category G1 Predicted
Cancel Serial Number: 1081
Original Issue Time: 2025 Dec 15 2245 UTC

Comment: Conditions no longer warrant watch.

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.

teisipäev, 16 detsember 2025

01:11 UTC

Space Weather Message Code: WARK04
Serial Number: 5185
Issue Time: 2025 Dec 16 0111 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 16 0110 UTC
Valid To: 2025 Dec 16 0600 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.

esmaspäev, 15 detsember 2025

22:45 UTC

Space Weather Message Code: WATA20
Serial Number: 1081
Issue Time: 2025 Dec 15 2245 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Dec 16: None (Below G1) Dec 17: None (Below G1) Dec 18: 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.

pühapäev, 14 detsember 2025

09:32 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1458
Issue Time: 2025 Dec 14 0932 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 14 0744 UTC
Estimated Velocity: 585 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.

laupäev, 13 detsember 2025

14:56 UTC

Space Weather Message Code: WARK04
Serial Number: 5184
Issue Time: 2025 Dec 13 1456 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5183
Valid From: 2025 Dec 10 2040 UTC
Now Valid Until: 2025 Dec 14 0600 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.

11:06 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1457
Issue Time: 2025 Dec 13 1106 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 13 1049 UTC
Estimated Velocity: 778 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.

03:02 UTC

Space Weather Message Code: ALTK05
Serial Number: 1930
Issue Time: 2025 Dec 13 0302 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Dec 13 0259 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.

reede, 12 detsember 2025

22:50 UTC

Space Weather Message Code: ALTK05
Serial Number: 1929
Issue Time: 2025 Dec 12 2250 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Dec 12 2248 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.

22:37 UTC

Space Weather Message Code: WARK04
Serial Number: 5183
Issue Time: 2025 Dec 12 2237 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5182
Valid From: 2025 Dec 10 2040 UTC
Now Valid Until: 2025 Dec 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 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.

19:43 UTC

Space Weather Message Code: ALTK05
Serial Number: 1928
Issue Time: 2025 Dec 12 1943 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Dec 12 1942 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.

19:42 UTC

Space Weather Message Code: WARK05
Serial Number: 2155
Issue Time: 2025 Dec 12 1942 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Dec 12 1940 UTC
Valid To: 2025 Dec 13 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.

10:55 UTC

Space Weather Message Code: WARK04
Serial Number: 5182
Issue Time: 2025 Dec 12 1055 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5181
Valid From: 2025 Dec 10 2040 UTC
Now Valid Until: 2025 Dec 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 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.

05:58 UTC

Space Weather Message Code: ALTTP4
Serial Number: 700
Issue Time: 2025 Dec 12 0558 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Dec 12 0527 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.

05:55 UTC

Space Weather Message Code: WARK05
Serial Number: 2154
Issue Time: 2025 Dec 12 0555 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2153
Valid From: 2025 Dec 11 1900 UTC
Now Valid Until: 2025 Dec 12 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.

05:28 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1456
Issue Time: 2025 Dec 12 0528 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 12 0508 UTC
Estimated Velocity: 410 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.

neljapäev, 11 detsember 2025

23:39 UTC

Space Weather Message Code: WARK04
Serial Number: 5181
Issue Time: 2025 Dec 11 2339 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5180
Valid From: 2025 Dec 10 2040 UTC
Now Valid Until: 2025 Dec 12 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.

23:39 UTC

Space Weather Message Code: WARK05
Serial Number: 2153
Issue Time: 2025 Dec 11 2339 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2152
Valid From: 2025 Dec 11 1900 UTC
Now Valid Until: 2025 Dec 12 0600 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.

20:59 UTC

Space Weather Message Code: ALTK05
Serial Number: 1927
Issue Time: 2025 Dec 11 2059 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Dec 11 1914 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.

19:19 UTC

Space Weather Message Code: WARK05
Serial Number: 2152
Issue Time: 2025 Dec 11 1919 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Dec 11 1900 UTC
Valid To: 2025 Dec 12 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.

03:39 UTC

Space Weather Message Code: WARK05
Serial Number: 2151
Issue Time: 2025 Dec 11 0339 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2150
Valid From: 2025 Dec 10 2115 UTC
Now Valid Until: 2025 Dec 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 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.

03:37 UTC

Space Weather Message Code: WARK04
Serial Number: 5180
Issue Time: 2025 Dec 11 0337 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5179
Valid From: 2025 Dec 10 2040 UTC
Now Valid Until: 2025 Dec 11 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.

02:55 UTC

Space Weather Message Code: WARK06
Serial Number: 629
Issue Time: 2025 Dec 11 0255 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 628
Valid From: 2025 Dec 10 2200 UTC
Now Valid Until: 2025 Dec 11 0600 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.

02:52 UTC

Space Weather Message Code: ALTK06
Serial Number: 679
Issue Time: 2025 Dec 11 0252 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Dec 11 0242 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.

00:16 UTC

Space Weather Message Code: SUM10R
Serial Number: 895
Issue Time: 2025 Dec 11 0016 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Dec 10 2206 UTC
Maximum Time: 2025 Dec 10 2206 UTC
End Time: 2025 Dec 10 2208 UTC
Duration: 2 minutes
Peak Flux: 520 sfu
Latest Penticton Noon Flux: 168 sfu

Comment: This summary contains the corrected peak flux of 520 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.

00:14 UTC

Space Weather Message Code: SUM10R
Serial Number: 894
Issue Time: 2025 Dec 11 0014 UTC

CANCEL SUMMARY: 10cm Radio Burst
Cancel Serial Number: 893
Original Issue Time: 2025 Dec 10 2226 UTC

Comment: the total flux was 520 sfu instead of the reported one.



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.

kolmapäev, 10 detsember 2025

22:44 UTC

Space Weather Message Code: ALTK06
Serial Number: 678
Issue Time: 2025 Dec 10 2244 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Dec 10 2243 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.

22:29 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1455
Issue Time: 2025 Dec 10 2229 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 10 2208 UTC
Estimated Velocity: 849 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.

22:26 UTC

Space Weather Message Code: SUM10R
Serial Number: 893
Issue Time: 2025 Dec 10 2226 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Dec 10 2206 UTC
Maximum Time: 2025 Dec 10 2206 UTC
End Time: 2025 Dec 10 2208 UTC
Duration: 2 minutes
Peak Flux: 2695 sfu
Latest Penticton Noon Flux: 168 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.

22:13 UTC

Space Weather Message Code: ALTK05
Serial Number: 1926
Issue Time: 2025 Dec 10 2213 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Dec 10 2207 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.

22:07 UTC

Space Weather Message Code: WARK05
Serial Number: 2150
Issue Time: 2025 Dec 10 2207 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2149
Valid From: 2025 Dec 10 2115 UTC
Now Valid Until: 2025 Dec 11 0600 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.

22:06 UTC

Space Weather Message Code: WARK04
Serial Number: 5179
Issue Time: 2025 Dec 10 2206 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5178
Valid From: 2025 Dec 10 2040 UTC
Now Valid Until: 2025 Dec 11 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 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.

21:57 UTC

Space Weather Message Code: WARK06
Serial Number: 628
Issue Time: 2025 Dec 10 2157 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Dec 10 2200 UTC
Valid To: 2025 Dec 11 0300 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.

21:20 UTC

Space Weather Message Code: ALTK04
Serial Number: 2615
Issue Time: 2025 Dec 10 2120 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Dec 10 2111 UTC
Synoptic Period: 2100-2400 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.

21:17 UTC

Space Weather Message Code: WARK05
Serial Number: 2149
Issue Time: 2025 Dec 10 2117 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Dec 10 2115 UTC
Valid To: 2025 Dec 11 0300 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.

20:40 UTC

Space Weather Message Code: WARK04
Serial Number: 5178
Issue Time: 2025 Dec 10 2040 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 10 2040 UTC
Valid To: 2025 Dec 11 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.

07:08 UTC

Space Weather Message Code: WARK04
Serial Number: 5177
Issue Time: 2025 Dec 10 0708 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 10 0707 UTC
Valid To: 2025 Dec 10 1500 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.

teisipäev, 9 detsember 2025

21:03 UTC

Space Weather Message Code: WATA50
Serial Number: 95
Issue Time: 2025 Dec 09 2103 UTC

CANCEL WATCH: Geomagnetic Storm Category G3 Predicted
Cancel Serial Number: 94
Original Issue Time: 2025 Dec 07 0443 UTC

Comment: Enhancement from anticipated CME did not occur

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.

12:10 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3575
Issue Time: 2025 Dec 09 1210 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3574
Begin Time: 2025 Dec 05 1530 UTC
Yesterday Maximum 2MeV Flux: 1040 pfu



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

02:56 UTC

Space Weather Message Code: ALTTP4
Serial Number: 699
Issue Time: 2025 Dec 09 0256 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Dec 09 0220 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.

02:15 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1454
Issue Time: 2025 Dec 09 0215 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 09 0152 UTC
Estimated Velocity: 759 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.

02:04 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1453
Issue Time: 2025 Dec 09 0204 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 09 0141 UTC
Estimated Velocity: 1825 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.

esmaspäev, 8 detsember 2025

12:37 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3574
Issue Time: 2025 Dec 08 1237 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3573
Begin Time: 2025 Dec 05 1530 UTC
Yesterday Maximum 2MeV Flux: 1453 pfu



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

05:13 UTC

Space Weather Message Code: SUMX01
Serial Number: 204
Issue Time: 2025 Dec 08 0513 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2025 Dec 08 0449 UTC
Maximum Time: 2025 Dec 08 0501 UTC
End Time: 2025 Dec 08 0504 UTC
X-ray Class: X1.1
Location: S18W55
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.

05:02 UTC

Space Weather Message Code: ALTXMF
Serial Number: 505
Issue Time: 2025 Dec 08 0502 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Dec 08 0500 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.

00:46 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1452
Issue Time: 2025 Dec 08 0046 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 08 0017 UTC
Estimated Velocity: 317 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.

pühapäev, 7 detsember 2025

21:39 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3573
Issue Time: 2025 Dec 07 2139 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3572
Begin Time: 2025 Dec 05 1530 UTC
Yesterday Maximum 2MeV Flux: 2135 pfu



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

06:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 2614
Issue Time: 2025 Dec 07 0601 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Dec 07 0559 UTC
Synoptic Period: 0300-0600 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.

04:43 UTC

Space Weather Message Code: WATA50
Serial Number: 94
Issue Time: 2025 Dec 07 0443 UTC

WATCH: Geomagnetic Storm Category G3 Predicted

Highest Storm Level Predicted by Day:
Dec 08: G1 (Minor) Dec 09: G3 (Strong) Dec 10: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: Watches for G3 (Strong) on 09 Dec and G1 (Minor) on 10 Dec are in anticipation of CME arrival from the M8 flare at 06/2039 UTC.

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.

04:23 UTC

Space Weather Message Code: WARK04
Serial Number: 5176
Issue Time: 2025 Dec 07 0423 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 07 0422 UTC
Valid To: 2025 Dec 07 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.

laupäev, 6 detsember 2025

21:07 UTC

Space Weather Message Code: ALTTP4
Serial Number: 698
Issue Time: 2025 Dec 06 2107 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Dec 06 2057 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.

20:57 UTC

Space Weather Message Code: SUMXM5
Serial Number: 301
Issue Time: 2025 Dec 06 2057 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2025 Dec 06 2029 UTC
Maximum Time: 2025 Dec 06 2039 UTC
End Time: 2025 Dec 06 2049 UTC
X-ray Class: M8.1
Optical Class: 2b
Location: N20E01
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.

20:54 UTC

Space Weather Message Code: SUM10R
Serial Number: 892
Issue Time: 2025 Dec 06 2054 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Dec 06 2035 UTC
Maximum Time: 2025 Dec 06 2036 UTC
End Time: 2025 Dec 06 2039 UTC
Duration: 4 minutes
Peak Flux: 1100 sfu
Latest Penticton Noon Flux: 200 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.

20:51 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1451
Issue Time: 2025 Dec 06 2051 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 06 2040 UTC
Estimated Velocity: 1143 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.

20:41 UTC

Space Weather Message Code: ALTXMF
Serial Number: 504
Issue Time: 2025 Dec 06 2041 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Dec 06 2037 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.

12:34 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3572
Issue Time: 2025 Dec 06 1234 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3571
Begin Time: 2025 Dec 05 1530 UTC
Yesterday Maximum 2MeV Flux: 1426 pfu



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

08:52 UTC

Space Weather Message Code: WARK04
Serial Number: 5175
Issue Time: 2025 Dec 06 0852 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5174
Valid From: 2025 Dec 06 0205 UTC
Now Valid Until: 2025 Dec 06 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.

08:37 UTC

Space Weather Message Code: WARK05
Serial Number: 2148
Issue Time: 2025 Dec 06 0837 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Dec 06 0836 UTC
Valid To: 2025 Dec 06 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.