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.

čtvrtek 13. března 2025

05:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4867
Issue Time: 2025 Mar 13 0555 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4866
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 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.

05:55 UTC

Space Weather Message Code: WARK05
Serial Number: 1990
Issue Time: 2025 Mar 13 0555 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1989
Valid From: 2025 Mar 12 1050 UTC
Now Valid Until: 2025 Mar 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 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.

04:35 UTC

Space Weather Message Code: ALTK05
Serial Number: 1714
Issue Time: 2025 Mar 13 0435 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 13 0435 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

01:32 UTC

Space Weather Message Code: ALTK05
Serial Number: 1713
Issue Time: 2025 Mar 13 0132 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 13 0131 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.

středa 12. března 2025

23:53 UTC

Space Weather Message Code: ALTK05
Serial Number: 1712
Issue Time: 2025 Mar 12 2353 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 12 2353 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.

23:02 UTC

Space Weather Message Code: WARK05
Serial Number: 1989
Issue Time: 2025 Mar 12 2302 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1988
Valid From: 2025 Mar 12 1050 UTC
Now Valid Until: 2025 Mar 13 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.

20:55 UTC

Space Weather Message Code: ALTK05
Serial Number: 1711
Issue Time: 2025 Mar 12 2055 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 12 2051 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.

17:52 UTC

Space Weather Message Code: WARK04
Serial Number: 4866
Issue Time: 2025 Mar 12 1752 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4865
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 13 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.

17:51 UTC

Space Weather Message Code: WARK05
Serial Number: 1988
Issue Time: 2025 Mar 12 1751 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1987
Valid From: 2025 Mar 12 1050 UTC
Now Valid Until: 2025 Mar 13 0000 UTC
Warning Condition: Persistence

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

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

17:49 UTC

Space Weather Message Code: ALTK05
Serial Number: 1710
Issue Time: 2025 Mar 12 1749 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 12 1742 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.

11:16 UTC

Space Weather Message Code: ALTK04
Serial Number: 2535
Issue Time: 2025 Mar 12 1116 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 12 1030 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes

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

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

10:50 UTC

Space Weather Message Code: WARK05
Serial Number: 1987
Issue Time: 2025 Mar 12 1050 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 12 1050 UTC
Valid To: 2025 Mar 12 1800 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

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

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

07:47 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1406
Issue Time: 2025 Mar 12 0747 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Mar 12 0503 UTC
Estimated Velocity: 403 km/s



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

07:35 UTC

Space Weather Message Code: WARK04
Serial Number: 4865
Issue Time: 2025 Mar 12 0735 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 12 0735 UTC
Valid To: 2025 Mar 12 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.

07:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3430
Issue Time: 2025 Mar 12 0701 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3429
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 4110 pfu



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

02:37 UTC

Space Weather Message Code: ALTK04
Serial Number: 2534
Issue Time: 2025 Mar 12 0237 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 12 0236 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

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

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

00:07 UTC

Space Weather Message Code: WARK04
Serial Number: 4864
Issue Time: 2025 Mar 12 0007 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 12 0006 UTC
Valid To: 2025 Mar 12 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.

úterý 11. března 2025

09:22 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3429
Issue Time: 2025 Mar 11 0922 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3428
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 2397 pfu



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

pondělí 10. března 2025

12:07 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3428
Issue Time: 2025 Mar 10 1207 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Mar 10 1150 UTC
Station: GOES16




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

neděle 9. března 2025

23:20 UTC

Space Weather Message Code: WARK06
Serial Number: 565
Issue Time: 2025 Mar 09 2320 UTC

CANCEL WARNING: Geomagnetic K-Index of 6 expected
Cancel Serial Number: 564
Original Issue Time: 2025 Mar 09 0423 UTC

Comment: The previous extention was an error. The conditions for this level of geomagnetic activity no longer exist.

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

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

23:19 UTC

Space Weather Message Code: WARK04
Serial Number: 4863
Issue Time: 2025 Mar 09 2319 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4862
Valid From: 2025 Mar 08 1500 UTC
Now Valid Until: 2025 Mar 10 0600 UTC
Warning Condition: Persisence

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.

23:18 UTC

Space Weather Message Code: WARK06
Serial Number: 564
Issue Time: 2025 Mar 09 2318 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 563
Valid From: 2025 Mar 09 0422 UTC
Now Valid Until: 2025 Mar 10 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.

10:40 UTC

Space Weather Message Code: WARK06
Serial Number: 563
Issue Time: 2025 Mar 09 1040 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 562
Valid From: 2025 Mar 09 0422 UTC
Now Valid Until: 2025 Mar 09 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 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.

10:40 UTC

Space Weather Message Code: ALTK06
Serial Number: 617
Issue Time: 2025 Mar 09 1040 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Mar 09 1040 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

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

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

09:32 UTC

Space Weather Message Code: ALTK05
Serial Number: 1709
Issue Time: 2025 Mar 09 0932 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 09 0931 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

05:59 UTC

Space Weather Message Code: ALTK06
Serial Number: 616
Issue Time: 2025 Mar 09 0559 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Mar 09 0559 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

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

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

04:23 UTC

Space Weather Message Code: WARK06
Serial Number: 562
Issue Time: 2025 Mar 09 0423 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Mar 09 0422 UTC
Valid To: 2025 Mar 09 1200 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

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

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

04:23 UTC

Space Weather Message Code: WARK05
Serial Number: 1986
Issue Time: 2025 Mar 09 0423 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1985
Valid From: 2025 Mar 08 2019 UTC
Now Valid Until: 2025 Mar 09 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.

04:23 UTC

Space Weather Message Code: WARK04
Serial Number: 4862
Issue Time: 2025 Mar 09 0423 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4861
Valid From: 2025 Mar 08 1500 UTC
Now Valid Until: 2025 Mar 09 2359 UTC
Warning Condition: Persisence

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.

04:06 UTC

Space Weather Message Code: ALTK05
Serial Number: 1708
Issue Time: 2025 Mar 09 0406 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 09 0405 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

02:57 UTC

Space Weather Message Code: ALTK05
Serial Number: 1707
Issue Time: 2025 Mar 09 0257 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 09 0255 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.

sobota 8. března 2025

23:15 UTC

Space Weather Message Code: ALTK05
Serial Number: 1706
Issue Time: 2025 Mar 08 2315 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 08 2310 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.

21:03 UTC

Space Weather Message Code: ALTK05
Serial Number: 1705
Issue Time: 2025 Mar 08 2103 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 08 2059 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.

20:20 UTC

Space Weather Message Code: WARK05
Serial Number: 1985
Issue Time: 2025 Mar 08 2020 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 08 2019 UTC
Valid To: 2025 Mar 09 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.

14:56 UTC

Space Weather Message Code: WARK04
Serial Number: 4861
Issue Time: 2025 Mar 08 1456 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 08 1500 UTC
Valid To: 2025 Mar 09 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.

09:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 2533
Issue Time: 2025 Mar 08 0901 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 08 0859 UTC
Synoptic Period: 0600-0900 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.

06:58 UTC

Space Weather Message Code: WARK04
Serial Number: 4860
Issue Time: 2025 Mar 08 0658 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 08 0700 UTC
Valid To: 2025 Mar 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.

pátek 7. března 2025

19:12 UTC

Space Weather Message Code: WATA20
Serial Number: 1033
Issue Time: 2025 Mar 07 1912 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 08: None (Below G1) Mar 09: G1 (Minor) Mar 10: 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.

02:56 UTC

Space Weather Message Code: WATA20
Serial Number: 1032
Issue Time: 2025 Mar 07 0256 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 07: None (Below G1) Mar 08: None (Below G1) Mar 09: 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.

středa 5. března 2025

11:54 UTC

Space Weather Message Code: WARK04
Serial Number: 4859
Issue Time: 2025 Mar 05 1154 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4858
Valid From: 2025 Mar 04 2132 UTC
Now Valid Until: 2025 Mar 05 1800 UTC
Warning Condition: persistence

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

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

úterý 4. března 2025

21:39 UTC

Space Weather Message Code: WARK05
Serial Number: 1984
Issue Time: 2025 Mar 04 2139 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 04 2139 UTC
Valid To: 2025 Mar 05 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.

21:36 UTC

Space Weather Message Code: ALTK04
Serial Number: 2532
Issue Time: 2025 Mar 04 2136 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 04 2127 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.

21:33 UTC

Space Weather Message Code: WARK04
Serial Number: 4858
Issue Time: 2025 Mar 04 2133 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 04 2132 UTC
Valid To: 2025 Mar 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.

18:44 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3427
Issue Time: 2025 Mar 04 1844 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3426
Begin Time: 2025 Mar 02 1510 UTC
Yesterday Maximum 2MeV Flux: 1134 pfu



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

neděle 2. března 2025

15:48 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3426
Issue Time: 2025 Mar 02 1548 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Mar 02 1510 UTC
Station: GOES-16




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

05:22 UTC

Space Weather Message Code: WATA20
Serial Number: 1031
Issue Time: 2025 Mar 02 0522 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 03: None (Below G1) Mar 04: G1 (Minor) Mar 05: 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.

sobota 1. března 2025

21:11 UTC

Space Weather Message Code: WARK04
Serial Number: 4857
Issue Time: 2025 Mar 01 2111 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4856
Valid From: 2025 Feb 27 0101 UTC
Now Valid Until: 2025 Mar 02 1200 UTC
Warning Condition: Persistence

Comment: Correction for valid time date from 01 Mar to 02 Mar.

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.

20:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4856
Issue Time: 2025 Mar 01 2055 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4855
Valid From: 2025 Feb 27 0101 UTC
Now Valid Until: 2025 Mar 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.

pátek 28. února 2025

17:57 UTC

Space Weather Message Code: ALTK05
Serial Number: 1704
Issue Time: 2025 Feb 28 1757 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 28 1757 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.

17:18 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1405
Issue Time: 2025 Feb 28 1718 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Feb 28 1700 UTC
Estimated Velocity: 1151 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.

15:00 UTC

Space Weather Message Code: ALTK05
Serial Number: 1703
Issue Time: 2025 Feb 28 1500 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 28 1459 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.

14:19 UTC

Space Weather Message Code: WARK05
Serial Number: 1983
Issue Time: 2025 Feb 28 1419 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1982
Valid From: 2025 Feb 27 1052 UTC
Now Valid Until: 2025 Mar 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 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.

14:17 UTC

Space Weather Message Code: WARK04
Serial Number: 4855
Issue Time: 2025 Feb 28 1417 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4854
Valid From: 2025 Feb 27 0101 UTC
Now Valid Until: 2025 Mar 01 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.

05:54 UTC

Space Weather Message Code: WARK05
Serial Number: 1982
Issue Time: 2025 Feb 28 0554 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1981
Valid From: 2025 Feb 27 1052 UTC
Now Valid Until: 2025 Feb 28 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.

02:17 UTC

Space Weather Message Code: ALTK05
Serial Number: 1702
Issue Time: 2025 Feb 28 0217 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 28 0215 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.

čtvrtek 27. února 2025

23:56 UTC

Space Weather Message Code: WARK05
Serial Number: 1981
Issue Time: 2025 Feb 27 2356 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1980
Valid From: 2025 Feb 27 1052 UTC
Now Valid Until: 2025 Feb 28 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.

18:02 UTC

Space Weather Message Code: ALTK05
Serial Number: 1701
Issue Time: 2025 Feb 27 1802 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 27 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.

17:42 UTC

Space Weather Message Code: WARK04
Serial Number: 4854
Issue Time: 2025 Feb 27 1742 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4853
Valid From: 2025 Feb 27 0101 UTC
Now Valid Until: 2025 Feb 28 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.

17:38 UTC

Space Weather Message Code: WARK05
Serial Number: 1980
Issue Time: 2025 Feb 27 1738 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1979
Valid From: 2025 Feb 27 1052 UTC
Now Valid Until: 2025 Feb 27 2359 UTC
Warning Condition: Persistence

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

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

11:14 UTC

Space Weather Message Code: ALTK06
Serial Number: 615
Issue Time: 2025 Feb 27 1114 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Feb 27 1110 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

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

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

11:09 UTC

Space Weather Message Code: WARK06
Serial Number: 561
Issue Time: 2025 Feb 27 1109 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Feb 27 1108 UTC
Valid To: 2025 Feb 27 1500 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

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

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

10:57 UTC

Space Weather Message Code: ALTK05
Serial Number: 1700
Issue Time: 2025 Feb 27 1057 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 27 1052 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

10:53 UTC

Space Weather Message Code: WARK05
Serial Number: 1979
Issue Time: 2025 Feb 27 1053 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Feb 27 1052 UTC
Valid To: 2025 Feb 27 1800 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

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

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

10:47 UTC

Space Weather Message Code: WARK04
Serial Number: 4853
Issue Time: 2025 Feb 27 1047 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4852
Valid From: 2025 Feb 27 0101 UTC
Now Valid Until: 2025 Feb 27 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.

02:22 UTC

Space Weather Message Code: ALTK04
Serial Number: 2531
Issue Time: 2025 Feb 27 0222 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Feb 27 0222 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

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

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

01:01 UTC

Space Weather Message Code: WARK04
Serial Number: 4852
Issue Time: 2025 Feb 27 0101 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 27 0101 UTC
Valid To: 2025 Feb 27 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.

středa 26. února 2025

14:54 UTC

Space Weather Message Code: WARK04
Serial Number: 4851
Issue Time: 2025 Feb 26 1454 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4850
Valid From: 2025 Feb 26 0431 UTC
Now Valid Until: 2025 Feb 26 2359 UTC
Warning Condition: Persistence

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

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

12:03 UTC

Space Weather Message Code: SUMPX1
Serial Number: 121
Issue Time: 2025 Feb 26 1203 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2025 Feb 25 0020 UTC
Maximum Time: 2025 Feb 25 0240 UTC
End Time: 2025 Feb 25 1115 UTC
Maximum 10MeV Flux: 37 pfu
NOAA Scale: S1 - Minor

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

06:02 UTC

Space Weather Message Code: ALTK04
Serial Number: 2530
Issue Time: 2025 Feb 26 0602 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Feb 26 0553 UTC
Synoptic Period: 0600-0900 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.

04:32 UTC

Space Weather Message Code: WARK04
Serial Number: 4850
Issue Time: 2025 Feb 26 0432 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 26 0431 UTC
Valid To: 2025 Feb 26 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 25. února 2025

23:43 UTC

Space Weather Message Code: WARPX1
Serial Number: 596
Issue Time: 2025 Feb 25 2343 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 595
Valid From: 2025 Feb 24 2338 UTC
Now Valid Until: 2025 Feb 26 1200 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

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

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

23:26 UTC

Space Weather Message Code: WARK04
Serial Number: 4849
Issue Time: 2025 Feb 25 2326 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 25 2325 UTC
Valid To: 2025 Feb 26 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.

14:47 UTC

Space Weather Message Code: WARPX1
Serial Number: 595
Issue Time: 2025 Feb 25 1447 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 594
Valid From: 2025 Feb 24 2338 UTC
Now Valid Until: 2025 Feb 25 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

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

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

12:32 UTC

Space Weather Message Code: SUM10R
Serial Number: 861
Issue Time: 2025 Feb 25 1232 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Feb 25 1136 UTC
Maximum Time: 2025 Feb 25 1137 UTC
End Time: 2025 Feb 25 1149 UTC
Duration: 13 minutes
Peak Flux: 230 sfu
Latest Penticton Noon Flux: 203 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.

12:31 UTC

Space Weather Message Code: ALTTP4
Serial Number: 678
Issue Time: 2025 Feb 25 1231 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Feb 25 1139 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.

12:31 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1404
Issue Time: 2025 Feb 25 1231 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Feb 25 1145 UTC
Estimated Velocity: 630 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.

11:49 UTC

Space Weather Message Code: WARPX1
Serial Number: 594
Issue Time: 2025 Feb 25 1149 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 593
Valid From: 2025 Feb 24 2338 UTC
Now Valid Until: 2025 Feb 25 2100 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

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

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

00:28 UTC

Space Weather Message Code: ALTPX1
Serial Number: 356
Issue Time: 2025 Feb 25 0028 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2025 Feb 25 0020 UTC
NOAA Scale: S1 - Minor

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

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

pondělí 24. února 2025

23:57 UTC

Space Weather Message Code: WARK04
Serial Number: 4848
Issue Time: 2025 Feb 24 2357 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4847
Valid From: 2025 Feb 24 1325 UTC
Now Valid Until: 2025 Feb 25 1500 UTC
Warning Condition: Persistence

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

Potential Impacts: Area of impact primarily poleward of 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.

23:38 UTC

Space Weather Message Code: WARPX1
Serial Number: 593
Issue Time: 2025 Feb 24 2338 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2025 Feb 24 2338 UTC
Valid To: 2025 Feb 25 1200 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor

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

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

22:42 UTC

Space Weather Message Code: ALTTP4
Serial Number: 677
Issue Time: 2025 Feb 24 2242 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Feb 24 2220 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.

22:31 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1403
Issue Time: 2025 Feb 24 2231 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Feb 24 2209 UTC
Estimated Velocity: 641 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.

20:10 UTC

Space Weather Message Code: WARK05
Serial Number: 1978
Issue Time: 2025 Feb 24 2010 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Feb 24 2010 UTC
Valid To: 2025 Feb 24 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.

20:04 UTC

Space Weather Message Code: ALTK04
Serial Number: 2529
Issue Time: 2025 Feb 24 2004 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Feb 24 1958 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.

13:25 UTC

Space Weather Message Code: WARK04
Serial Number: 4847
Issue Time: 2025 Feb 24 1325 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 24 1325 UTC
Valid To: 2025 Feb 24 2359 UTC
Warning Condition: Onset

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

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

07:22 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1402
Issue Time: 2025 Feb 24 0722 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Feb 24 0703 UTC
Estimated Velocity: 588 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.

02:22 UTC

Space Weather Message Code: WARK04
Serial Number: 4846
Issue Time: 2025 Feb 24 0222 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 24 0222 UTC
Valid To: 2025 Feb 24 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.

neděle 23. února 2025

20:14 UTC

Space Weather Message Code: SUMX01
Serial Number: 189
Issue Time: 2025 Feb 23 2014 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2025 Feb 23 1922 UTC
Maximum Time: 2025 Feb 23 1927 UTC
End Time: 2025 Feb 23 1934 UTC
X-ray Class: X2.0
Location: N26W90
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.

19:31 UTC

Space Weather Message Code: ALTXMF
Serial Number: 476
Issue Time: 2025 Feb 23 1931 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Feb 23 1925 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.

čtvrtek 20. února 2025

09:09 UTC

Space Weather Message Code: SUM10R
Serial Number: 860
Issue Time: 2025 Feb 20 0909 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Feb 20 0444 UTC
Maximum Time: 2025 Feb 20 0444 UTC
End Time: 2025 Feb 20 0445 UTC
Duration: 1 minutes
Peak Flux: 200 sfu
Latest Penticton Noon Flux: 178 sfu



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

08:37 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1401
Issue Time: 2025 Feb 20 0837 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Feb 19 2338 UTC
Estimated Velocity: 553 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.

středa 19. února 2025

20:58 UTC

Space Weather Message Code: ALTK04
Serial Number: 2528
Issue Time: 2025 Feb 19 2058 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Feb 19 2055 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.

20:25 UTC

Space Weather Message Code: WARK04
Serial Number: 4845
Issue Time: 2025 Feb 19 2025 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 19 2024 UTC
Valid To: 2025 Feb 20 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.

08:04 UTC

Space Weather Message Code: WARK05
Serial Number: 1977
Issue Time: 2025 Feb 19 0804 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Feb 19 0804 UTC
Valid To: 2025 Feb 19 1500 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

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

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

07:37 UTC

Space Weather Message Code: WARK04
Serial Number: 4844
Issue Time: 2025 Feb 19 0737 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4843
Valid From: 2025 Feb 18 2234 UTC
Now Valid Until: 2025 Feb 19 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.

01:49 UTC

Space Weather Message Code: ALTK05
Serial Number: 1699
Issue Time: 2025 Feb 19 0149 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 19 0149 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

00:02 UTC

Space Weather Message Code: ALTK05
Serial Number: 1698
Issue Time: 2025 Feb 19 0002 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 18 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.

úterý 18. února 2025

22:43 UTC

Space Weather Message Code: WARK05
Serial Number: 1975
Issue Time: 2025 Feb 18 2243 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Feb 18 2242 UTC
Valid To: 2025 Feb 19 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.

22:36 UTC

Space Weather Message Code: ALTK04
Serial Number: 2527
Issue Time: 2025 Feb 18 2236 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Feb 18 2236 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.

22:35 UTC

Space Weather Message Code: WARK04
Serial Number: 4843
Issue Time: 2025 Feb 18 2235 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 18 2234 UTC
Valid To: 2025 Feb 19 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.

08:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4842
Issue Time: 2025 Feb 18 0855 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4841
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 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 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.

pondělí 17. února 2025

23:47 UTC

Space Weather Message Code: WARK04
Serial Number: 4841
Issue Time: 2025 Feb 17 2347 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4840
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 18 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.

11:24 UTC

Space Weather Message Code: WARK04
Serial Number: 4840
Issue Time: 2025 Feb 17 1124 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4839
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 17 2359 UTC
Warning Condition: Persistence

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

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

04:44 UTC

Space Weather Message Code: WARK04
Serial Number: 4839
Issue Time: 2025 Feb 17 0444 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4838
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 17 1200 UTC
Warning Condition: Persistence

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

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

03:47 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3425
Issue Time: 2025 Feb 17 0347 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3424
Begin Time: 2025 Feb 11 1405 UTC
Yesterday Maximum 2MeV Flux: 3934 pfu



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

neděle 16. února 2025

20:20 UTC

Space Weather Message Code: WARK04
Serial Number: 4838
Issue Time: 2025 Feb 16 2020 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4837
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 17 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.

14:22 UTC

Space Weather Message Code: WARK04
Serial Number: 4837
Issue Time: 2025 Feb 16 1422 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4836
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 16 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.

04:37 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3424
Issue Time: 2025 Feb 16 0437 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3423
Begin Time: 2025 Feb 11 1405 UTC
Yesterday Maximum 2MeV Flux: 4741 pfu



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

04:18 UTC

Space Weather Message Code: WARK04
Serial Number: 4836
Issue Time: 2025 Feb 16 0418 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4835
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 16 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.

sobota 15. února 2025

21:15 UTC

Space Weather Message Code: WATA20
Serial Number: 1030
Issue Time: 2025 Feb 15 2115 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Feb 16: G1 (Minor) Feb 17: None (Below G1) Feb 18: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

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

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

18:22 UTC

Space Weather Message Code: ALTK05
Serial Number: 1697
Issue Time: 2025 Feb 15 1822 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 15 1759 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.

17:33 UTC

Space Weather Message Code: WARK05
Serial Number: 1974
Issue Time: 2025 Feb 15 1733 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1973
Valid From: 2025 Feb 15 1015 UTC
Now Valid Until: 2025 Feb 15 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.

17:32 UTC

Space Weather Message Code: WARK04
Serial Number: 4835
Issue Time: 2025 Feb 15 1732 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4834
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 16 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.

10:34 UTC

Space Weather Message Code: WARK06
Serial Number: 560
Issue Time: 2025 Feb 15 1034 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Feb 15 1030 UTC
Valid To: 2025 Feb 15 1500 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

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

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

10:30 UTC

Space Weather Message Code: ALTK05
Serial Number: 1696
Issue Time: 2025 Feb 15 1030 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 15 1024 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

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

10:09 UTC

Space Weather Message Code: WARK05
Serial Number: 1973
Issue Time: 2025 Feb 15 1009 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Feb 15 1015 UTC
Valid To: 2025 Feb 15 1800 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

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

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

04:51 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3423
Issue Time: 2025 Feb 15 0451 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3422
Begin Time: 2025 Feb 11 1405 UTC
Yesterday Maximum 2MeV Flux: 6603 pfu



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

04:15 UTC

Space Weather Message Code: WARK04
Serial Number: 4834
Issue Time: 2025 Feb 15 0415 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4833
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 15 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.

pátek 14. února 2025

21:51 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1400
Issue Time: 2025 Feb 14 2151 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Feb 14 2107 UTC
Estimated Velocity: 941 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.

19:46 UTC

Space Weather Message Code: WATA20
Serial Number: 1029
Issue Time: 2025 Feb 14 1946 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

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

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: Isolated periods of G1 (Minor) geomagnetic storming are likely early on 15 Feb 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 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.

15:05 UTC

Space Weather Message Code: ALTK05
Serial Number: 1695
Issue Time: 2025 Feb 14 1505 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 14 1459 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.

14:52 UTC

Space Weather Message Code: WARK05
Serial Number: 1972
Issue Time: 2025 Feb 14 1452 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1971
Valid From: 2025 Feb 13 2320 UTC
Now Valid Until: 2025 Feb 14 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.

14:51 UTC

Space Weather Message Code: WARK04
Serial Number: 4833
Issue Time: 2025 Feb 14 1451 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4832
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 15 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.

12:47 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3422
Issue Time: 2025 Feb 14 1247 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3421
Begin Time: 2025 Feb 11 1405 UTC
Yesterday Maximum 2MeV Flux: 2426 pfu



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

03:03 UTC

Space Weather Message Code: ALTK05
Serial Number: 1694
Issue Time: 2025 Feb 14 0303 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 14 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.

čtvrtek 13. února 2025

23:22 UTC

Space Weather Message Code: WARK04
Serial Number: 4832
Issue Time: 2025 Feb 13 2322 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4831
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 14 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.

23:22 UTC

Space Weather Message Code: WARK05
Serial Number: 1971
Issue Time: 2025 Feb 13 2322 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Feb 13 2320 UTC
Valid To: 2025 Feb 14 1500 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

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

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

19:57 UTC

Space Weather Message Code: WARK04
Serial Number: 4831
Issue Time: 2025 Feb 13 1957 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4830
Valid From: 2025 Feb 13 0527 UTC
Now Valid Until: 2025 Feb 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.

19:36 UTC

Space Weather Message Code: WATA20
Serial Number: 1028
Issue Time: 2025 Feb 13 1936 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Feb 14: G1 (Minor) Feb 15: None (Below G1) Feb 16: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

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

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

14:09 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3421
Issue Time: 2025 Feb 13 1409 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3420
Begin Time: 2025 Feb 11 1405 UTC
Yesterday Maximum 2MeV Flux: 2050 pfu



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

05:37 UTC

Space Weather Message Code: ALTK04
Serial Number: 2526
Issue Time: 2025 Feb 13 0537 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Feb 13 0534 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.

05:27 UTC

Space Weather Message Code: WARK04
Serial Number: 4830
Issue Time: 2025 Feb 13 0527 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 13 0527 UTC
Valid To: 2025 Feb 13 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.

středa 12. února 2025

11:51 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3420
Issue Time: 2025 Feb 12 1151 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3419
Begin Time: 2025 Feb 11 1405 UTC
Yesterday Maximum 2MeV Flux: 2077 pfu



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

09:51 UTC

Space Weather Message Code: WARK04
Serial Number: 4829
Issue Time: 2025 Feb 12 0951 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4828
Valid From: 2025 Feb 09 1430 UTC
Now Valid Until: 2025 Feb 13 0300 UTC
Warning Condition: Persistence

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

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

úterý 11. února 2025

14:21 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3419
Issue Time: 2025 Feb 11 1421 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Feb 11 1405 UTC
Station: GOES16




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

11:34 UTC

Space Weather Message Code: WARK04
Serial Number: 4828
Issue Time: 2025 Feb 11 1134 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4827
Valid From: 2025 Feb 09 1430 UTC
Now Valid Until: 2025 Feb 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.