Local 3/15/2026, 11:15:54 PM
UTC 2026-03-15T23:15:54.907Z
Space Weather Message Code: ALTK04Serial Number: 2644Issue Time: 2026 Mar 15 2315 UTCALERT: Geomagnetic K-index of 4Threshold Reached: 2026 Mar 15 2310 UTCSynoptic Period: 2100-2400 UTCActive Warning: YesNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/15/2026, 11:15:10 PM
UTC 2026-03-15T23:15:10.933Z
Space Weather Message Code: ALTK04Serial Number: 2643Issue Time: 2026 Mar 15 2315 UTCCANCEL ALERT: Geomagnetic K-index of 4Cancel Serial Number: 2642Original Issue Time: 2026 Mar 15 2314 UTCComment: Incorrectly entered start time.NOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/15/2026, 11:14:06 PM
UTC 2026-03-15T23:14:06.087Z
Space Weather Message Code: ALTK04Serial Number: 2642Issue Time: 2026 Mar 15 2314 UTCALERT: Geomagnetic K-index of 4Threshold Reached: 2026 Mar 15 2300 UTCSynoptic Period: 2100-2400 UTCActive Warning: YesNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/15/2026, 11:10:08 PM
UTC 2026-03-15T23:10:08.973Z
Space Weather Message Code: WARK04Serial Number: 5288Issue Time: 2026 Mar 15 2310 UTCWARNING: Geomagnetic K-index of 4 expectedValid From: 2026 Mar 15 2309 UTCValid To: 2026 Mar 16 1200 UTCWarning Condition: OnsetNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/15/2026, 4:45:09 PM
UTC 2026-03-15T16:45:09.667Z
Space Weather Message Code: ALTEF3Serial Number: 3647Issue Time: 2026 Mar 15 1645 UTCALERT: Electron 2MeV Integral Flux exceeded 1000pfuThreshold Reached: 2026 Mar 15 1630 UTCStation: GOES19Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Local 3/15/2026, 11:22:31 AM
UTC 2026-03-15T11:22:31.110Z
Space Weather Message Code: ALTK04Serial Number: 2641Issue Time: 2026 Mar 15 1122 UTCALERT: Geomagnetic K-index of 4Threshold Reached: 2026 Mar 15 1122 UTCSynoptic Period: 0900-1200 UTCActive Warning: YesNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/15/2026, 11:19:18 AM
UTC 2026-03-15T11:19:18.180Z
Space Weather Message Code: WARK04Serial Number: 5287Issue Time: 2026 Mar 15 1119 UTCWARNING: Geomagnetic K-index of 4 expectedValid From: 2026 Mar 15 1119 UTCValid To: 2026 Mar 15 2100 UTCWarning Condition: OnsetNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/14/2026, 8:27:00 PM
UTC 2026-03-14T20:27:00.270Z
Space Weather Message Code: WARK04Serial Number: 5286Issue Time: 2026 Mar 14 2027 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5285Valid From: 2026 Mar 13 0156 UTCNow Valid Until: 2026 Mar 15 0900 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/14/2026, 5:04:50 PM
UTC 2026-03-14T17:04:50.790Z
Space Weather Message Code: WATA20Serial Number: 1101Issue Time: 2026 Mar 14 1704 UTCWATCH: Geomagnetic Storm Category G1 PredictedHighest Storm Level Predicted by Day:Mar 15: G1 (Minor) Mar 16: None (Below G1) Mar 17: None (Below G1)THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECTComment: G1 (Minor) geomagnetic storming remains likely on 15 Mar due to ongoing CH HSS effects.NOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/14/2026, 2:50:21 PM
UTC 2026-03-14T14:50:21.157Z
Space Weather Message Code: ALTK05Serial Number: 1978Issue Time: 2026 Mar 14 1450 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Mar 14 1448 UTCSynoptic Period: 1200-1500 UTCActive Warning: YesNOAA Scale: G1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/14/2026, 9:00:11 AM
UTC 2026-03-14T09:00:11.373Z
Space Weather Message Code: ALTK05Serial Number: 1977Issue Time: 2026 Mar 14 0900 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Mar 14 0859 UTCSynoptic Period: 0600-0900 UTCActive Warning: YesNOAA Scale: G1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.