Local 3/22/2026, 10:26:40 AM
UTC 2026-03-22T10:26:40.000Z
Space Weather Message Code: ALTK06Serial Number: 704Issue Time: 2026 Mar 22 1026 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2026 Mar 22 1026 UTCSynoptic Period: 0900-1200 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/22/2026, 10:24:03 AM
UTC 2026-03-22T10:24:03.347Z
Space Weather Message Code: WARK06Serial Number: 647Issue Time: 2026 Mar 22 1024 UTCWARNING: Geomagnetic K-Index of 6 expectedValid From: 2026 Mar 22 1020 UTCValid To: 2026 Mar 22 1800 UTCWarning Condition: OnsetNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/22/2026, 9:53:22 AM
UTC 2026-03-22T09:53:22.207Z
Space Weather Message Code: ALTK05Serial Number: 1986Issue Time: 2026 Mar 22 0953 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Mar 22 0953 UTCSynoptic Period: 0900-1200 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 3/22/2026, 8:45:57 AM
UTC 2026-03-22T08:45:57.260Z
Space Weather Message Code: ALTK05Serial Number: 1985Issue Time: 2026 Mar 22 0845 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Mar 22 0845 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.
Local 3/22/2026, 5:25:52 AM
UTC 2026-03-22T05:25:52.580Z
Space Weather Message Code: ALTK05Serial Number: 1984Issue Time: 2026 Mar 22 0525 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Mar 22 0525 UTCSynoptic Period: 0300-0600 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 3/22/2026, 5:14:17 AM
UTC 2026-03-22T05:14:17.543Z
Space Weather Message Code: WARK05Serial Number: 2211Issue Time: 2026 Mar 22 0514 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2210Valid From: 2026 Mar 20 1930 UTCNow Valid Until: 2026 Mar 22 2359 UTCWarning Condition: PersistenceNOAA 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 3/22/2026, 5:13:30 AM
UTC 2026-03-22T05:13:30.400Z
Space Weather Message Code: WARK04Serial Number: 5293Issue Time: 2026 Mar 22 0513 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5292Valid From: 2026 Mar 20 0719 UTCNow Valid Until: 2026 Mar 22 2359 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 3/21/2026, 7:46:17 PM
UTC 2026-03-21T19:46:17.017Z
Space Weather Message Code: WATA30Serial Number: 266Issue Time: 2026 Mar 21 1946 UTCWATCH: Geomagnetic Storm Category G2 PredictedHighest Storm Level Predicted by Day:Mar 22: G2 (Moderate) Mar 23: G1 (Minor) Mar 24: None (Below G1)THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECTComment: G2 (Moderate) geomagnetic storming is likely on 22 Mar due to waning CME influences followed by the anticipated arrival of CH HSS effects. Isolated periods of G1 (Minor) geomagnetic storming is likely to continue into 23 Mar as CH HSS effects continue.NOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/21/2026, 4:50:24 PM
UTC 2026-03-21T16:50:24.710Z
Space Weather Message Code: WARK05Serial Number: 2210Issue Time: 2026 Mar 21 1650 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2209Valid From: 2026 Mar 20 1930 UTCNow Valid Until: 2026 Mar 22 0600 UTCWarning Condition: PersistenceNOAA 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 3/21/2026, 4:47:28 PM
UTC 2026-03-21T16:47:28.173Z
Space Weather Message Code: WARK04Serial Number: 5292Issue Time: 2026 Mar 21 1647 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5291Valid From: 2026 Mar 20 0719 UTCNow Valid Until: 2026 Mar 22 1200 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 3/21/2026, 7:53:07 AM
UTC 2026-03-21T07:53:07.250Z
Space Weather Message Code: ALTK05Serial Number: 1983Issue Time: 2026 Mar 21 0753 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Mar 21 0752 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.
Local 3/21/2026, 5:17:35 AM
UTC 2026-03-21T05:17:35.590Z
Space Weather Message Code: WARK06Serial Number: 646Issue Time: 2026 Mar 21 0517 UTCEXTENDED WARNING: Geomagnetic K-Index of 6 expectedExtension to Serial Number: 645Valid From: 2026 Mar 20 2020 UTCNow Valid Until: 2026 Mar 21 1500 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/21/2026, 5:17:35 AM
UTC 2026-03-21T05:17:35.583Z
Space Weather Message Code: ALTK06Serial Number: 703Issue Time: 2026 Mar 21 0517 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2026 Mar 21 0514 UTCSynoptic Period: 0300-0600 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/21/2026, 5:17:35 AM
UTC 2026-03-21T05:17:35.570Z
Space Weather Message Code: WARK05Serial Number: 2209Issue Time: 2026 Mar 21 0517 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2208Valid From: 2026 Mar 20 1930 UTCNow Valid Until: 2026 Mar 21 1800 UTCWarning Condition: PersistenceNOAA 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 3/21/2026, 5:17:35 AM
UTC 2026-03-21T05:17:35.560Z
Space Weather Message Code: WARK04Serial Number: 5291Issue Time: 2026 Mar 21 0517 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5290Valid From: 2026 Mar 20 0719 UTCNow Valid Until: 2026 Mar 21 2359 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 3/21/2026, 3:32:05 AM
UTC 2026-03-21T03:32:05.153Z
Space Weather Message Code: ALTK05Serial Number: 1982Issue Time: 2026 Mar 21 0332 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Mar 21 0331 UTCSynoptic Period: 0300-0600 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 3/21/2026, 1:54:56 AM
UTC 2026-03-21T01:54:56.203Z
Space Weather Message Code: ALTK07Serial Number: 213Issue Time: 2026 Mar 21 0154 UTCALERT: Geomagnetic K-index of 7Threshold Reached: 2026 Mar 21 0154 UTCSynoptic Period: 0000-0300 UTCActive Warning: YesNOAA Scale: G3 - StrongNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.Radio - HF (high frequency) radio may be intermittent.Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Local 3/21/2026, 1:41:52 AM
UTC 2026-03-21T01:41:52.367Z
Space Weather Message Code: ALTK06Serial Number: 702Issue Time: 2026 Mar 21 0141 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2026 Mar 21 0141 UTCSynoptic Period: 0000-0300 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/21/2026, 12:34:35 AM
UTC 2026-03-21T00:34:35.307Z
Space Weather Message Code: ALTK05Serial Number: 1981Issue Time: 2026 Mar 21 0034 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Mar 21 0033 UTCSynoptic Period: 0000-0300 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 3/20/2026, 11:29:12 PM
UTC 2026-03-20T23:29:12.240Z
Space Weather Message Code: ALTK07Serial Number: 212Issue Time: 2026 Mar 20 2329 UTCALERT: Geomagnetic K-index of 7Threshold Reached: 2026 Mar 20 2328 UTCSynoptic Period: 2100-2400 UTCActive Warning: YesNOAA Scale: G3 - StrongNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.Radio - HF (high frequency) radio may be intermittent.Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Local 3/20/2026, 11:05:56 PM
UTC 2026-03-20T23:05:56.793Z
Space Weather Message Code: WARK07Serial Number: 145Issue Time: 2026 Mar 20 2305 UTCWARNING: Geomagnetic K-index of 7 or greater expectedValid From: 2026 Mar 20 2305 UTCValid To: 2026 Mar 21 0600 UTCWarning Condition: OnsetNOAA Scale: G3 or greaterNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.Radio - HF (high frequency) radio may be intermittent.Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Local 3/20/2026, 10:12:22 PM
UTC 2026-03-20T22:12:22.787Z
Space Weather Message Code: ALTK06Serial Number: 701Issue Time: 2026 Mar 20 2212 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2026 Mar 20 2208 UTCSynoptic Period: 2100-2400 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/20/2026, 9:36:31 PM
UTC 2026-03-20T21:36:31.443Z
Space Weather Message Code: ALTK05Serial Number: 1980Issue Time: 2026 Mar 20 2136 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Mar 20 2126 UTCSynoptic Period: 2100-2400 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 3/20/2026, 9:09:53 PM
UTC 2026-03-20T21:09:53.620Z
Space Weather Message Code: SUMSUDSerial Number: 296Issue Time: 2026 Mar 20 2109 UTCSUMMARY: Geomagnetic Sudden ImpulseObserved: 2026 Mar 20 2053 UTCDeviation: 56 nTStation: BOUNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanation
Local 3/20/2026, 9:04:30 PM
UTC 2026-03-20T21:04:30.617Z
Space Weather Message Code: ALTK06Serial Number: 700Issue Time: 2026 Mar 20 2104 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2026 Mar 20 2059 UTCSynoptic Period: 1800-2100 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/20/2026, 8:43:58 PM
UTC 2026-03-20T20:43:58.600Z
Space Weather Message Code: WATA50Serial Number: 96Issue Time: 2026 Mar 20 2043 UTCWATCH: Geomagnetic Storm Category G3 PredictedHighest Storm Level Predicted by Day:Mar 20: G3 (Strong) Mar 21: G3 (Strong) Mar 22: G1 (Minor)THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECTComment: G3 (Strong) geomagnetic storming is likely due to combined CME effects from events that left the Sun on 16 and 18 Mar.NOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.Radio - HF (high frequency) radio may be intermittent.Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Local 3/20/2026, 8:40:35 PM
UTC 2026-03-20T20:40:35.003Z
Space Weather Message Code: WARSUDSerial Number: 251Issue Time: 2026 Mar 20 2040 UTCWARNING: Geomagnetic Sudden Impulse expectedValid From: 2026 Mar 20 2050 UTCValid To: 2026 Mar 20 2120 UTCIP Shock Passage Observed: 2026 Mar 20 2118 UTCNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanation
Local 3/20/2026, 8:22:56 PM
UTC 2026-03-20T20:22:56.357Z
Space Weather Message Code: WARK06Serial Number: 645Issue Time: 2026 Mar 20 2022 UTCWARNING: Geomagnetic K-Index of 6 expectedValid From: 2026 Mar 20 2020 UTCValid To: 2026 Mar 21 0600 UTCWarning Condition: OnsetNOAA Scale: G2 - ModerateComment: G2 (Moderate) geomagnetic storm conditions are expected into the the early portions of 21 Mar (UTC) due to CME effects.NOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 3/20/2026, 8:18:58 PM
UTC 2026-03-20T20:18:58.940Z
Space Weather Message Code: ALTK05Serial Number: 1979Issue Time: 2026 Mar 20 2018 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Mar 20 2018 UTCSynoptic Period: 1800-2100 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 3/20/2026, 7:32:04 PM
UTC 2026-03-20T19:32:04.137Z
Space Weather Message Code: WARK05Serial Number: 2208Issue Time: 2026 Mar 20 1932 UTCWARNING: Geomagnetic K-index of 5 expectedValid From: 2026 Mar 20 1930 UTCValid To: 2026 Mar 21 0900 UTCWarning Condition: OnsetNOAA 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 3/20/2026, 2:55:19 PM
UTC 2026-03-20T14:55:19.443Z
Space Weather Message Code: ALTEF3Serial Number: 3652Issue Time: 2026 Mar 20 1455 UTCCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfuContinuation of Serial Number: 3651Begin Time: 2026 Mar 15 1630 UTCYesterday Maximum 2MeV Flux: 4941 pfuPotential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Local 3/20/2026, 12:39:56 PM
UTC 2026-03-20T12:39:56.870Z
Space Weather Message Code: WARK04Serial Number: 5290Issue Time: 2026 Mar 20 1239 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5289Valid From: 2026 Mar 20 0719 UTCNow Valid Until: 2026 Mar 21 1200 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.