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Space Weather Message Code: ALTEF3
Serial Number: 3438
Issue Time: 2025 Mar 18 0734 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3437
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 6680 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: 4877
Issue Time: 2025 Mar 18 0556 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4876
Valid From: 2025 Mar 17 0345 UTC
Now Valid Until: 2025 Mar 18 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
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Space Weather Message Code: ALTK04
Serial Number: 2536
Issue Time: 2025 Mar 17 2102 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 17 2059 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.
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Space Weather Message Code: WARK04
Serial Number: 4876
Issue Time: 2025 Mar 17 2054 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4875
Valid From: 2025 Mar 17 0345 UTC
Now Valid Until: 2025 Mar 18 0600 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
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Space Weather Message Code: WARK04
Serial Number: 4875
Issue Time: 2025 Mar 17 1448 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4874
Valid From: 2025 Mar 17 0345 UTC
Now Valid Until: 2025 Mar 17 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.
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Space Weather Message Code: ALTEF3
Serial Number: 3437
Issue Time: 2025 Mar 17 0521 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3436
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 5055 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: 4874
Issue Time: 2025 Mar 17 0348 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 17 0345 UTC
Valid To: 2025 Mar 17 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.
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Space Weather Message Code: WARK04
Serial Number: 4873
Issue Time: 2025 Mar 16 1448 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 16 1447 UTC
Valid To: 2025 Mar 17 0300 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
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Space Weather Message Code: ALTEF3
Serial Number: 3436
Issue Time: 2025 Mar 16 0737 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3435
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 4951 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
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Space Weather Message Code: ALTEF3
Serial Number: 3435
Issue Time: 2025 Mar 15 0500 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3434
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 3982 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: 4872
Issue Time: 2025 Mar 15 0155 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4871
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 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 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.
______________________________________________________
Space Weather Message Code: ALTEF3
Serial Number: 3434
Issue Time: 2025 Mar 15 0142 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3433
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 3982 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: 4871
Issue Time: 2025 Mar 14 1734 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4870
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 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.
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Space Weather Message Code: ALTEF3
Serial Number: 3433
Issue Time: 2025 Mar 14 1045 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3432
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 1561 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
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Space Weather Message Code: ALTK06
Serial Number: 618
Issue Time: 2025 Mar 14 0141 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Mar 14 0142 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
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Space Weather Message Code: WARK06
Serial Number: 566
Issue Time: 2025 Mar 14 0140 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Mar 14 0140 UTC
Valid To: 2025 Mar 14 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.
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Space Weather Message Code: WARK05
Serial Number: 1993
Issue Time: 2025 Mar 14 0130 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1992
Valid From: 2025 Mar 13 1930 UTC
Now Valid Until: 2025 Mar 14 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.
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Space Weather Message Code: WARK04
Serial Number: 4870
Issue Time: 2025 Mar 14 0129 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4869
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 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.
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Space Weather Message Code: ALTEF3
Serial Number: 3432
Issue Time: 2025 Mar 14 0127 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3431
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 1561 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
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Space Weather Message Code: ALTK05
Serial Number: 1719
Issue Time: 2025 Mar 14 0125 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 14 0120 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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https://www.swpc.noaa.gov/products/alerts-watches-and-warnings