Upozornění, Hodiny a Varování NOAA SWPC

National Oceanic and Atmospheric Administration Space Weather Foreiction Center (NOAA SWPC) je oficiální vládní agentura pro vesmírné počasí ze Spojených států, která poskytuje výstrahy, časy a varování před rušivým vesmírním počasím. Níže naleznete nejnovější výstrahy, časy a varování vydané vesmírným počasím vydané SWPC NOAA.

středa 27. května 2026

02:28 UTC

Space Weather Message Code: SUMPX1
Serial Number: 130
Issue Time: 2026 May 27 0228 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2026 May 27 0015 UTC
Maximum Time: 2026 May 26 0110 UTC
End Time: 2026 May 26 0425 UTC
Maximum 10MeV Flux: 23 pfu
Noaa Scale: S1 - Minor
Comment:

NOAA Scale: S1 - Minor

02:27 UTC

Space Weather Message Code: SUMPX1
Serial Number: 129
Issue Time: 2026 May 27 0227 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2026 May 26 0015 UTC
Maximum Time: 2026 May 26 0110 UTC
End Time: 2026 May 26 0425 UTC
Maximum 10MeV Flux: 23 pfu
Noaa Scale: S1 - Minor
Comment:

NOAA Scale: S1 - Minor

00:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 2658
Issue Time: 2026 May 27 0001 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 May 26 2359 UTC
Synoptic Period: 2100-2400
Active Warning: YES
Comment:



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.

úterý 26. května 2026

21:38 UTC

Space Weather Message Code: WARK04
Serial Number: 5347
Issue Time: 2026 May 26 2138 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 May 26 2137 UTC
Valid To: 2026 May 27 0600 UTC
Warning Conditions: Onset
Comment:



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.

14:22 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1494
Issue Time: 2026 May 26 1422 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 26 1244 UTC
Estimate Velocity: 650 km/s
Comment: SVI; updated with correct start time


SVI; updated with correct start time

14:20 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1494
Issue Time: 2026 May 26 1420 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 26 1420 UTC
Estimate Velocity: 650 km/s
Comment: SVI


SVI

14:19 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1493
Issue Time: 2026 May 26 1419 UTC

CANCELLED ALERT: Type II Radio Emission
Cancel Serial Number: 1490
Original Issued Time: 2026-05-26T14:19:00
Cancelled 2026-05-26 14:19 by Forecaster User Duplicate.

Cancelled 2026-05-26 14:19 by Forecaster User Duplicate.

14:19 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1492
Issue Time: 2026 May 26 1419 UTC

CANCELLED ALERT: Type II Radio Emission
Cancel Serial Number: 1491
Original Issued Time: 2026-05-26T14:19:00
Cancelled 2026-05-26 14:19 by Forecaster User Duplicate.

Cancelled 2026-05-26 14:19 by Forecaster User Duplicate.

14:19 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1491
Issue Time: 2026 May 26 1419 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 26 1244 UTC
Estimate Velocity: 650 km/s
Comment: SVI


SVI

14:19 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1490
Issue Time: 2026 May 26 1419 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 26 1244 UTC
Estimate Velocity: 650 km/s
Comment: SVI


SVI

14:19 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1490
Issue Time: 2026 May 26 1418 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 26 1244 UTC
Estimate Velocity: 650 km/s
Comment: SVI


SVI

14:19 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1490
Issue Time: 2026 May 26 1419 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 26 1244 UTC
Estimate Velocity: 650 km/s
Comment: SVI


SVI

14:19 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1490
Issue Time: 2026 May 26 1419 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 26 1244 UTC
Estimate Velocity: 650 km/s
Comment: SVI


SVI

14:19 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1490
Issue Time: 2026 May 26 1419 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 26 1244 UTC
Estimate Velocity: 650 km/s
Comment: SVI


SVI

14:19 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1490
Issue Time: 2026 May 26 1419 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 26 1244 UTC
Estimate Velocity: 650 km/s
Comment: SVI


SVI

00:35 UTC

Space Weather Message Code: ALTPX1
Serial Number: 365
Issue Time: 2026 May 26 0035 UTC

ALERT: Proton Event 10meV Integral Flux exceeded 10pfu
Begin Time: 2026 May 26 0010 UTC
Noaa Scale: S1 - Minor
Comment:

NOAA Scale: S1 - Minor

00:16 UTC

Space Weather Message Code: WARPX1
Serial Number: 625
Issue Time: 2026 May 26 0016 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2026 May 26 0015 UTC
Valid To: 2026 May 26 2359 UTC
Warning Conditions: Onset
Noaa Scale: S1 - Minor
Comment:

NOAA Scale: S1 - Minor

neděle 24. května 2026

12:11 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1489
Issue Time: 2026 May 24 1211 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 24 0850 UTC
Estimate Velocity: 579 km/s
Comment:

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3694
Issue Time: 2026 May 24 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3693
Begin Time: 2026-05-16 17:40
Yesterday Maximum 2MeV Flux: 3762 pfu
Continued 2026-05-24 04:59 by Forecaster User

Continued 2026-05-24 04:59 by Forecaster User

sobota 23. května 2026

20:00 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1488
Issue Time: 2026 May 23 2000 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 23 1941 UTC
Estimate Velocity: 932 km/s
Comment:

06:31 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3693
Issue Time: 2026 May 23 0631 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3692
Begin Time: 2026-05-16 17:40
Yesterday Maximum 2MeV Flux: 3762 pfu
Continued 2026-05-23 06:31 by Forecaster User

Continued 2026-05-23 06:31 by Forecaster User

pátek 22. května 2026

05:07 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3692
Issue Time: 2026 May 22 0507 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3691
Begin Time: 2026-05-16 17:40
Yesterday Maximum 2MeV Flux: 2842 pfu
Continued 2026-05-22 05:06 by Forecaster User

Continued 2026-05-22 05:06 by Forecaster User

čtvrtek 21. května 2026

05:09 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3691
Issue Time: 2026 May 21 0509 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3690
Begin Time: 2026-05-16 17:40
Yesterday Maximum 2MeV Flux: 1717 pfu
Continued 2026-05-21 05:07 by Forecaster User

Continued 2026-05-21 05:07 by Forecaster User

středa 20. května 2026

10:06 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3690
Issue Time: 2026 May 20 1006 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3689
Begin Time: 2026-05-16 17:40
Yesterday Maximum 2MeV Flux: 2860 pfu
Continued 2026-05-20 10:06 by Forecaster User

Continued 2026-05-20 10:06 by Forecaster User

úterý 19. května 2026

23:56 UTC

Space Weather Message Code: WARK04
Serial Number: 5346
Issue Time: 2026 May 19 2356 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5345
Valid From: 2026-05-19T07:01:00
Now Valid Until: 2026-05-20 06:00
Warning Condition: Persistence
Extended 2026-05-19 23:56 by Forecaster User

Extended 2026-05-19 23:56 by Forecaster User

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: WARK04
Serial Number: 5345
Issue Time: 2026 May 19 2057 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5344
Valid From: 2026-05-19T07:01:00
Now Valid Until: 2026-05-19 24:00
Warning Condition: Persistence
Extended 2026-05-19 20:57 by Forecaster User

Extended 2026-05-19 20:57 by Forecaster User

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.

16:42 UTC

Space Weather Message Code: WARK04
Serial Number: 5344
Issue Time: 2026 May 19 1642 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5343
Valid From: 2026-05-19T07:01:00
Now Valid Until: 2026-05-19 21:00
Warning Condition: Persistence
Extended 2026-05-19 16:41 by Forecaster User

Extended 2026-05-19 16:41 by Forecaster User

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.

08:55 UTC

Space Weather Message Code: ALTK04
Serial Number: 2657
Issue Time: 2026 May 19 0855 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 May 19 0828 UTC
Synoptic Period: 0600-0900
Active Warning: YES
Comment:



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.

07:03 UTC

Space Weather Message Code: WARK04
Serial Number: 5343
Issue Time: 2026 May 19 0703 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 May 19 0701 UTC
Valid To: 2026 May 19 1800 UTC
Warning Conditions: Onset
Comment:



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.

05:14 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3689
Issue Time: 2026 May 19 0514 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2026 May 16 1740 UTC
Station: GOES-19
Comment: Yesterday's max: 6667 pfu


Yesterday's max: 6667 pfu

04:56 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3689
Issue Time: 2026 May 19 0456 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3688
Begin Time: 2026-05-16 17:40
Yesterday Maximum 2MeV Flux: 6118 pfu
Continued 2026-05-19 05:00 by Forecaster User

Continued 2026-05-19 05:00 by Forecaster User

pondělí 18. května 2026

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3688
Issue Time: 2026 May 18 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3687
Begin Time: 2026-05-16 17:40
Yesterday Maximum 2MeV Flux: 6118 pfu
Continued 2026-05-18 04:59 by Forecaster User

Continued 2026-05-18 04:59 by Forecaster User

neděle 17. května 2026

21:16 UTC

Space Weather Message Code: SUM10R
Serial Number: 913
Issue Time: 2026 May 17 2116 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2026 May 17 2050 UTC
Maximum Time: 2026 May 17 2051 UTC
End Time: 2026 May 17 2051 UTC
Peak Flux: 370 sfu
Duration: 1 minutes
Latest Penticton Noon Flux: 104 sfu
Comment:

16:12 UTC

Space Weather Message Code: WATA20
Serial Number: 1113
Issue Time: 2026 May 17 1612 UTC

WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
May 18: G1 (Minor) May 19: G1 (Minor) May 20: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment:



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.

08:40 UTC

Space Weather Message Code: WARK04
Serial Number: 5342
Issue Time: 2026 May 17 0840 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5341
Valid From: 2026-05-13T20:26:00
Now Valid Until: 2026-05-17 21:00
Warning Condition: Persistence
Extended 2026-05-17 08:38 by Forecaster User

Extended 2026-05-17 08:38 by Forecaster User

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.

08:16 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3687
Issue Time: 2026 May 17 0816 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3686
Begin Time: 2026-05-16 17:40
Yesterday Maximum 2MeV Flux: 1902 pfu
Continued 2026-05-17 08:16 by Forecaster User

Continued 2026-05-17 08:16 by Forecaster User

sobota 16. května 2026

21:34 UTC

Space Weather Message Code: WATA20
Serial Number: 1112
Issue Time: 2026 May 16 2134 UTC

WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
May 17: G1 (Minor) May 18: G1 (Minor) May 19: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment:



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.

18:14 UTC

Space Weather Message Code: WARK05
Serial Number: 2237
Issue Time: 2026 May 16 1814 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2236
Valid From: 2026-05-15T13:05:00
Now Valid Until: 2026-05-17 09:00
Warning Condition: Persistence
Extended 2026-05-16 18:13 by WC

Extended 2026-05-16 18:13 by WC 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.

18:13 UTC

Space Weather Message Code: WARK04
Serial Number: 5341
Issue Time: 2026 May 16 1813 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5340
Valid From: 2026-05-13T20:26:00
Now Valid Until: 2026-05-17 09:00
Warning Condition: Persistence
Extended 2026-05-16 18:12 by WC

Extended 2026-05-16 18:12 by 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.

18:04 UTC

Space Weather Message Code: ALTK05
Serial Number: 2022
Issue Time: 2026 May 16 1804 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 May 16 1759 UTC
Synoptic Period: 1500-1800
Active Warning: YES
Noaa Scale: G1 - Minor
Comment:

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.

17:53 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3686
Issue Time: 2026 May 16 1753 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2026 May 16 1740 UTC
Station: GOES-19
Comment:

16:58 UTC

Space Weather Message Code: ALTTP4
Serial Number: 709
Issue Time: 2026 May 16 1658 UTC

ALERT: Type IV Radio Emission
Begin Time: 2026 May 16 1605 UTC
Comment:

16:37 UTC

Space Weather Message Code: SUM10R
Serial Number: 912
Issue Time: 2026 May 16 1637 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2026 May 16 1606 UTC
Maximum Time: 2026 May 16 1609 UTC
End Time: 2026 May 16 1610 UTC
Peak Flux: 170 sfu
Duration: 4 minutes
Latest Penticton Noon Flux: 101 sfu
Comment: COR for end date.


COR for end date.

16:31 UTC

Space Weather Message Code: SUM10R
Serial Number: 912
Issue Time: 2026 May 16 1631 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2026 May 16 1606 UTC
Maximum Time: 2026 May 16 1609 UTC
End Time: 2026 May 17 1610 UTC
Peak Flux: 170 sfu
Duration: 4 minutes
Latest Penticton Noon Flux: 101 sfu
Comment:

11:56 UTC

Space Weather Message Code: WARK04
Serial Number: 5340
Issue Time: 2026 May 16 1156 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5339
Valid From: 2026-05-13T20:26:00
Now Valid Until: 2026-05-16 23:59
Warning Condition: Persistence
Extended 2026-05-16 11:55 by Forecaster User

Extended 2026-05-16 11:55 by Forecaster User

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.

08:59 UTC

Space Weather Message Code: ALTK05
Serial Number: 2021
Issue Time: 2026 May 16 0859 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 May 16 0859 UTC
Synoptic Period: 0600-0900
Active Warning: YES
Noaa Scale: G1 - Minor
Comment:

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.

08:45 UTC

Space Weather Message Code: WARK05
Serial Number: 2236
Issue Time: 2026 May 16 0845 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2235
Valid From: 2026-05-15T13:05:00
Now Valid Until: 2026-05-16 21:00
Warning Condition: Persistence
Extended 2026-05-16 08:44 by Forecaster User

Extended 2026-05-16 08:44 by Forecaster User 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.

05:56 UTC

Space Weather Message Code: ALTK05
Serial Number: 2020
Issue Time: 2026 May 16 0556 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 May 16 0554 UTC
Synoptic Period: 0300-0600
Active Warning: YES
Noaa Scale: G1 - Minor
Comment:

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.

pátek 15. května 2026

23:56 UTC

Space Weather Message Code: WARK05
Serial Number: 2235
Issue Time: 2026 May 15 2356 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2234
Valid From: 2026-05-15T13:05:00
Now Valid Until: 2026-05-16 09:00
Warning Condition: Persistence
Extended 2026-05-15 23:55 by Forecaster User

Extended 2026-05-15 23:55 by Forecaster User 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.

22:15 UTC

Space Weather Message Code: ALTK06
Serial Number: 717
Issue Time: 2026 May 15 2215 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 May 15 2215 UTC
Synoptic Period: 2100-2400
Active Warning: YES
Noaa Scale: G2 - Moderate
Comment:

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.

22:02 UTC

Space Weather Message Code: WARK06
Serial Number: 660
Issue Time: 2026 May 15 2202 UTC

WARNING: Geomagnetic K-index of 6 expected
Valid From: 2026 May 15 2201 UTC
Valid To: 2026 May 16 0300 UTC
Warning Conditions: Onset
Noaa Scale: G2 - Moderate
Comment:

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.

17:18 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1487
Issue Time: 2026 May 15 1718 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 15 1616 UTC
Estimate Velocity: 529 km/s
Comment:

16:07 UTC

Space Weather Message Code: ALTK05
Serial Number: 2019
Issue Time: 2026 May 15 1607 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 May 15 1606 UTC
Synoptic Period: 1500-1800
Active Warning: YES
Noaa Scale: G1 - Minor
Comment:

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.

14:50 UTC

Space Weather Message Code: WARK06
Serial Number: 659
Issue Time: 2026 May 15 1450 UTC

WARNING: Geomagnetic K-index of 6 expected
Valid From: 2026 May 15 1449 UTC
Valid To: 2026 May 15 2100 UTC
Warning Conditions: Onset
Noaa Scale: G2 - Moderate
Comment:

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.

13:45 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1486
Issue Time: 2026 May 15 1345 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 15 1344 UTC
Estimate Velocity: 347 km/s
Comment:

13:27 UTC

Space Weather Message Code: ALTK05
Serial Number: 2018
Issue Time: 2026 May 15 1327 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 May 15 1326 UTC
Synoptic Period: 1200-1500
Active Warning: YES
Noaa Scale: G1 - Minor
Comment:

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.

13:12 UTC

Space Weather Message Code: WARK05
Serial Number: 2234
Issue Time: 2026 May 15 1307 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 May 15 1305 UTC
Valid To: 2026 May 15 2359 UTC
Warning Conditions: Onset
Noaa Scale: G1 - Minor
Comment:

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.

13:09 UTC

Space Weather Message Code: WARK04
Serial Number: 5339
Issue Time: 2026 May 15 1309 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5337
Valid From: 2026-05-13T20:26:00
Now Valid Until: 2026-05-16 12:00
Warning Condition: Persistence
Extended 2026-05-15 13:09 by Forecaster User

Extended 2026-05-15 13:09 by Forecaster User

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.

13:00 UTC

Space Weather Message Code: ALTK04
Serial Number: 2656
Issue Time: 2026 May 15 1300 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 May 15 1300 UTC
Synoptic Period: 1200-1500
Active Warning: YES
Comment:



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.

12:25 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1485
Issue Time: 2026 May 15 1225 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 15 1225 UTC
Estimate Velocity: 486 km/s
Comment:

11:58 UTC

Space Weather Message Code: WARK04
Serial Number: 5338
Issue Time: 2026 May 15 1158 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 May 15 1157 UTC
Valid To: 2026 May 16 0000 UTC
Warning Conditions: Onset
Comment:



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.

čtvrtek 14. května 2026

08:53 UTC

Space Weather Message Code: WATA30
Serial Number: 273
Issue Time: 2026 May 14 0853 UTC

WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
May 15: G2 (Moderate) May 16: G1 (Minor) May 17: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: included the G1 watch for day3 (17 May)


included the G1 watch for day3 (17 May)

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.

středa 13. května 2026

20:27 UTC

Space Weather Message Code: WARK04
Serial Number: 5337
Issue Time: 2026 May 13 2027 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 May 13 2026 UTC
Valid To: 2026 May 14 0600 UTC
Warning Conditions: Onset
Comment:



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.

09:07 UTC

Space Weather Message Code: WATA30
Serial Number: 273
Issue Time: 2026 May 13 0907 UTC

WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
May 14: None (Below G1) May 15: G2 (Moderate) May 16: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment:



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.

úterý 12. května 2026

13:26 UTC

Space Weather Message Code: WATA20
Serial Number: 1111
Issue Time: 2026 May 12 1326 UTC

WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
May 13: None (Below G1) May 14: None (Below G1) May 15: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: Negative CH influence


Negative CH 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 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.

neděle 10. května 2026

14:14 UTC

Space Weather Message Code: SUMXM5
Serial Number: 316
Issue Time: 2026 May 10 1414 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2026 May 10 1319 UTC
Maximum Time: 2026 May 10 1339 UTC
End Time: 2026 May 10 1402 UTC
Xray Class: M5.7
Optical Class:
Location: N18E65
Noaa Scale: R2 - Moderate
Comment:

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.

13:55 UTC

Space Weather Message Code: SUM10R
Serial Number: 911
Issue Time: 2026 May 10 1355 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2026 May 10 1328 UTC
Maximum Time: 2026 May 10 1334 UTC
End Time: 2026 May 10 1343 UTC
Peak Flux: 550 sfu
Duration: 15 minutes
Latest Penticton Noon Flux: 122 sfu
Comment:

13:47 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1484
Issue Time: 2026 May 10 1347 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 10 1329 UTC
Estimate Velocity: 650 km/s
Comment:

13:38 UTC

Space Weather Message Code: ALTXMF
Serial Number: 528
Issue Time: 2026 May 10 1338 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2026 May 10 1335 UTC
Noaa Scale: R2 - Moderate
Comment:

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.

pátek 8. května 2026

17:25 UTC

Space Weather Message Code: WARK04
Serial Number: 5336
Issue Time: 2026 May 08 1725 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 May 08 1724 UTC
Valid To: 2026 May 08 2359 UTC
Warning Conditions: Onset
Comment:



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.

čtvrtek 7. května 2026

16:37 UTC

Space Weather Message Code: WARK04
Serial Number: 5335
Issue Time: 2026 May 07 1637 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 May 07 1635 UTC
Valid To: 2026 May 08 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.

úterý 5. května 2026

02:49 UTC

Space Weather Message Code: ALTK05
Serial Number: 2016
Issue Time: 2026 May 05 0249 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 May 05 0244 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.

pondělí 4. května 2026

23:55 UTC

Space Weather Message Code: ALTK05
Serial Number: 2015
Issue Time: 2026 May 04 2355 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 May 04 2355 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.

23:39 UTC

Space Weather Message Code: WARK04
Serial Number: 5334
Issue Time: 2026 May 04 2339 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5333
Valid From: 2026 May 04 1645 UTC
Now Valid Until: 2026 May 05 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: 2232
Issue Time: 2026 May 04 2339 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2231
Valid From: 2026 May 04 1945 UTC
Now Valid Until: 2026 May 05 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.

23:39 UTC

Space Weather Message Code: WARK06
Serial Number: 657
Issue Time: 2026 May 04 2339 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 656
Valid From: 2026 May 04 2031 UTC
Now Valid Until: 2026 May 05 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.

20:32 UTC

Space Weather Message Code: ALTK06
Serial Number: 715
Issue Time: 2026 May 04 2032 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 May 04 2032 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.

20:31 UTC

Space Weather Message Code: WARK06
Serial Number: 656
Issue Time: 2026 May 04 2031 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 May 04 2031 UTC
Valid To: 2026 May 05 0000 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.

19:51 UTC

Space Weather Message Code: ALTK05
Serial Number: 2014
Issue Time: 2026 May 04 1951 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 May 04 1951 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: 2231
Issue Time: 2026 May 04 1950 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 May 04 1945 UTC
Valid To: 2026 May 05 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.

16:49 UTC

Space Weather Message Code: ALTK04
Serial Number: 2654
Issue Time: 2026 May 04 1649 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 May 04 1647 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.

16:49 UTC

Space Weather Message Code: WARK04
Serial Number: 5333
Issue Time: 2026 May 04 1649 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 May 04 1645 UTC
Valid To: 2026 May 05 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.

sobota 2. května 2026

11:11 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1482
Issue Time: 2026 May 02 1111 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 02 1051 UTC
Estimated Velocity: 641 km/s

Comment: Likely associated with C-class flare acitivity originating from AR 4420 on the west limb.



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.

pátek 1. května 2026

15:50 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1481
Issue Time: 2026 May 01 1550 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 01 1535 UTC
Estimated Velocity: 593 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.

čtvrtek 30. dubna 2026

23:59 UTC

Space Weather Message Code: ALTK05
Serial Number: 2013
Issue Time: 2026 Apr 30 2359 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Apr 30 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.

23:11 UTC

Space Weather Message Code: WARK04
Serial Number: 5332
Issue Time: 2026 Apr 30 2311 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5331
Valid From: 2026 Apr 30 2005 UTC
Now Valid Until: 2026 May 01 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.

23:09 UTC

Space Weather Message Code: WARK05
Serial Number: 2230
Issue Time: 2026 Apr 30 2309 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Apr 30 2309 UTC
Valid To: 2026 May 01 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.

20:35 UTC

Space Weather Message Code: ALTK04
Serial Number: 2653
Issue Time: 2026 Apr 30 2035 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Apr 30 2035 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.

20:06 UTC

Space Weather Message Code: WARK04
Serial Number: 5331
Issue Time: 2026 Apr 30 2006 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Apr 30 2005 UTC
Valid To: 2026 May 01 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.