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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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https://www.swpc.noaa.gov/products/alerts-watches-and-warnings