Advisories / Alerts

Weather Extremes

Issue Time: 2023 Mar 31 0600 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 Mar 31 0559 UTC Synoptic Period: 0300-0600 UTC Active Warning: Yes NOAA Scale: G1 - Minor 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.

Issue Time: 2023 Mar 30 2053 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4330 Valid From: 2023 Mar 30 0058 UTC Now Valid Until: 2023 Mar 31 1500 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 30 2052 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2023 Mar 30 2051 UTC Valid To: 2023 Mar 31 0600 UTC Warning Condition: Onset NOAA Scale: G1 - Minor 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.

Issue Time: 2023 Mar 30 1801 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 Mar 30 1759 UTC Synoptic Period: 1500-1800 UTC Active Warning: Yes 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.

Issue Time: 2023 Mar 30 1447 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4329 Valid From: 2023 Mar 30 0058 UTC Now Valid Until: 2023 Mar 31 0300 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 30 0855 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4328 Valid From: 2023 Mar 30 0058 UTC Now Valid Until: 2023 Mar 30 1500 UTC Warning Condition: Onset 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.

Issue Time: 2023 Mar 30 0803 UTC ALERT: Type IV Radio Emission Begin Time: 2023 Mar 30 0739 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.

Issue Time: 2023 Mar 30 0800 UTC SUMMARY: X-ray Event exceeded M5 Begin Time: 2023 Mar 30 0724 UTC Maximum Time: 2023 Mar 30 0737 UTC End Time: 2023 Mar 30 0743 UTC X-ray Class: M5.4 Optical Class: 1f Location: S22W81 NOAA Scale: R2 - Moderate Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth. Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

Issue Time: 2023 Mar 30 0752 UTC ALERT: Type II Radio Emission Begin Time: 2023 Mar 30 0735 UTC Estimated Velocity: 369 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.

Issue Time: 2023 Mar 30 0738 UTC ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2023 Mar 30 0736 UTC NOAA Scale: R2 - Moderate 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.

Issue Time: 2023 Mar 30 0058 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 Mar 30 0058 UTC Valid To: 2023 Mar 30 0900 UTC Warning Condition: Onset 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.

Issue Time: 2023 Mar 29 0501 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3310 Begin Time: 2023 Mar 27 0305 UTC Yesterday Maximum 2MeV Flux: 1897 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2023 Mar 29 0249 UTC SUMMARY: X-ray Event exceeded X1 Begin Time: 2023 Mar 29 0218 UTC Maximum Time: 2023 Mar 29 0233 UTC End Time: 2023 Mar 29 0240 UTC X-ray Class: X1.2 Location: S22W62 NOAA Scale: R3 - Strong 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.

Issue Time: 2023 Mar 29 0233 UTC ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2023 Mar 29 0230 UTC NOAA Scale: R2 - Moderate 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.

Issue Time: 2023 Mar 28 1429 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3309 Begin Time: 2023 Mar 27 0305 UTC Yesterday Maximum 2MeV Flux: 1572 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2023 Mar 27 0525 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3308 Begin Time: 2023 Mar 27 0305 UTC Yesterday Maximum 2MeV Flux: 1121 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2023 Mar 27 0328 UTC ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Threshold Reached: 2023 Mar 27 0305 UTC Station: GOES-16 Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2023 Mar 26 0855 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4326 Valid From: 2023 Mar 23 0827 UTC Now Valid Until: 2023 Mar 26 2100 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 25 2055 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4325 Valid From: 2023 Mar 23 0827 UTC Now Valid Until: 2023 Mar 26 0900 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 25 1101 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4324 Valid From: 2023 Mar 23 0827 UTC Now Valid Until: 2023 Mar 25 2100 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 24 2005 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 Mar 24 2004 UTC Synoptic Period: 1800-2100 UTC Active Warning: Yes NOAA Scale: G1 - Minor 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.

Issue Time: 2023 Mar 24 1719 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1759 Valid From: 2023 Mar 23 0905 UTC Now Valid Until: 2023 Mar 25 0600 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 24 1718 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4323 Valid From: 2023 Mar 23 0827 UTC Now Valid Until: 2023 Mar 25 1200 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 24 0901 UTC EXTENDED WARNING: Geomagnetic K-index of 7 or greater expected Extension to Serial Number: 90 Valid From: 2023 Mar 23 2250 UTC Now Valid Until: 2023 Mar 24 1200 UTC Warning Condition: Persistence Potential 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.

Issue Time: 2023 Mar 24 0901 UTC ALERT: Geomagnetic K-index of 7 Threshold Reached: 2023 Mar 24 0859 UTC Synoptic Period: 0600-0900 UTC Active Warning: Yes NOAA Scale: G3 - Strong Potential 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.

Issue Time: 2023 Mar 24 0901 UTC EXTENDED WARNING: Geomagnetic K-Index of 6 expected Extension to Serial Number: 477 Valid From: 2023 Mar 23 1420 UTC Now Valid Until: 2023 Mar 24 1800 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 24 0901 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1758 Valid From: 2023 Mar 23 0905 UTC Now Valid Until: 2023 Mar 24 1800 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 24 0901 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4322 Valid From: 2023 Mar 23 0827 UTC Now Valid Until: 2023 Mar 24 2359 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 24 0650 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2023 Mar 24 0644 UTC Synoptic Period: 0600-0900 UTC Active Warning: Yes NOAA Scale: G2 - Moderate 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.

Issue Time: 2023 Mar 24 0624 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 Mar 24 0617 UTC Synoptic Period: 0600-0900 UTC Active Warning: Yes NOAA Scale: G1 - Minor 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.

Issue Time: 2023 Mar 24 0416 UTC ALERT: Geomagnetic K-index of 8, 9- Threshold Reached: 2023 Mar 24 0404 UTC Synoptic Period: 0300-0600 UTC Active Warning: Yes NOAA Scale: G4 - Severe Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude. Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify. Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur. Navigation - Satellite navigation (GPS) degraded or inoperable for hours. Radio - HF (high frequency) radio propagation sporadic or blacked out. Aurora - Aurora may be seen as low as Alabama and northern California.

Issue Time: 2023 Mar 24 0344 UTC ALERT: Geomagnetic K-index of 7 Threshold Reached: 2023 Mar 24 0339 UTC Synoptic Period: 0300-0600 UTC Active Warning: Yes NOAA Scale: G3 - Strong Potential 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.

Issue Time: 2023 Mar 24 0329 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2023 Mar 24 0323 UTC Synoptic Period: 0300-0600 UTC Active Warning: Yes NOAA Scale: G2 - Moderate 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.

Issue Time: 2023 Mar 24 0325 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 Mar 24 0317 UTC Synoptic Period: 0300-0600 UTC Active Warning: Yes NOAA Scale: G1 - Minor 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.

Issue Time: 2023 Mar 24 0200 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1757 Valid From: 2023 Mar 23 0905 UTC Now Valid Until: 2023 Mar 24 1500 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 24 0200 UTC EXTENDED WARNING: Geomagnetic K-Index of 6 expected Extension to Serial Number: 476 Valid From: 2023 Mar 23 1420 UTC Now Valid Until: 2023 Mar 24 1200 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 24 0200 UTC EXTENDED WARNING: Geomagnetic K-index of 7 or greater expected Extension to Serial Number: 89 Valid From: 2023 Mar 23 2250 UTC Now Valid Until: 2023 Mar 24 0900 UTC Warning Condition: Persistence Potential 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.

Issue Time: 2023 Mar 24 0157 UTC ALERT: Geomagnetic K-index of 7 Threshold Reached: 2023 Mar 24 0155 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes NOAA Scale: G3 - Strong Potential 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.

Issue Time: 2023 Mar 24 0027 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2023 Mar 24 0025 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes NOAA Scale: G2 - Moderate 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.

Issue Time: 2023 Mar 24 0015 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 Mar 24 0014 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes NOAA Scale: G1 - Minor 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.

Issue Time: 2023 Mar 23 2355 UTC ALERT: Geomagnetic K-index of 7 Threshold Reached: 2023 Mar 23 2354 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes NOAA Scale: G3 - Strong Potential 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.

Issue Time: 2023 Mar 23 2251 UTC WARNING: Geomagnetic K-index of 7 or greater expected Valid From: 2023 Mar 23 2250 UTC Valid To: 2023 Mar 24 0300 UTC Warning Condition: Onset NOAA Scale: G3 or greater - Strong to Extreme Potential 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.

Issue Time: 2023 Mar 23 2148 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2023 Mar 23 2146 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes NOAA Scale: G2 - Moderate 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.

Issue Time: 2023 Mar 23 2136 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 Mar 23 2133 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes NOAA Scale: G1 - Minor 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.

Issue Time: 2023 Mar 23 2122 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Mar 24: G2 (Moderate) Mar 25: G1 (Minor) Mar 26: G1 (Minor) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT 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.

Issue Time: 2023 Mar 23 2006 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4321 Valid From: 2023 Mar 23 0827 UTC Now Valid Until: 2023 Mar 24 1500 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 23 1950 UTC EXTENDED WARNING: Geomagnetic K-Index of 6 expected Extension to Serial Number: 475 Valid From: 2023 Mar 23 1420 UTC Now Valid Until: 2023 Mar 24 0300 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 23 1946 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2023 Mar 23 1942 UTC Synoptic Period: 1800-2100 UTC Active Warning: Yes NOAA Scale: G2 - Moderate 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.

Issue Time: 2023 Mar 23 1725 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 Mar 23 1722 UTC Synoptic Period: 1500-1800 UTC Active Warning: Yes NOAA Scale: G1 - Minor 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.

Issue Time: 2023 Mar 23 1531 UTC ALERT: Geomagnetic K-index of 7 Threshold Reached: 2023 Mar 23 1449 UTC Synoptic Period: 1500-1800 UTC Active Warning: Yes NOAA Scale: G3 - Strong Comment: This alert is a correction. G3 conditions were first observed at 1449 UTC and not 1446 UTC as previously alerted on 23 Mar 2023 at 1450 UTC. This alert supercedes all previous G3 alerts. Potential 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.

Issue Time: 2023 Mar 23 1450 UTC ALERT: Geomagnetic K-index of 7 Threshold Reached: 2023 Mar 23 1446 UTC Synoptic Period: 1200-1500 UTC Active Warning: Yes NOAA Scale: G3 - Strong Potential 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.

Issue Time: 2023 Mar 23 1447 UTC WARNING: Geomagnetic K-index of 7 or greater expected Valid From: 2023 Mar 23 1447 UTC Valid To: 2023 Mar 23 1800 UTC Warning Condition: Onset NOAA Scale: G3 or greater - Strong to Extreme Potential 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.

Issue Time: 2023 Mar 23 1426 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2023 Mar 23 1423 UTC Synoptic Period: 1200-1500 UTC Active Warning: Yes NOAA Scale: G2 - Moderate 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.

Issue Time: 2023 Mar 23 1421 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1756 Valid From: 2023 Mar 23 0905 UTC Now Valid Until: 2023 Mar 24 0600 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 23 1420 UTC WARNING: Geomagnetic K-Index of 6 expected Valid From: 2023 Mar 23 1420 UTC Valid To: 2023 Mar 23 2100 UTC Warning Condition: Onset NOAA Scale: G2 - Moderate 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.

Issue Time: 2023 Mar 23 1236 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 Mar 23 1234 UTC Synoptic Period: 1200-1500 UTC Active Warning: Yes NOAA Scale: G1 - Minor 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.

Issue Time: 2023 Mar 23 0905 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2023 Mar 23 0905 UTC Valid To: 2023 Mar 23 1500 UTC Warning Condition: Onset NOAA Scale: G1 - Minor 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.

Issue Time: 2023 Mar 23 0905 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4320 Valid From: 2023 Mar 23 0827 UTC Now Valid Until: 2023 Mar 23 2100 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 23 0836 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 Mar 23 0836 UTC Synoptic Period: 0600-0900 UTC Active Warning: Yes 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.

Issue Time: 2023 Mar 23 0828 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 Mar 23 0827 UTC Valid To: 2023 Mar 23 1500 UTC Warning Condition: Onset 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.

Issue Time: 2023 Mar 22 1653 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Mar 23: G1 (Minor) Mar 24: G2 (Moderate) Mar 25: G1 (Minor) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT 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.

Issue Time: 2023 Mar 22 0555 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4318 Valid From: 2023 Mar 22 0045 UTC Now Valid Until: 2023 Mar 22 1500 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 22 0237 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 Mar 22 0237 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes 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.

Issue Time: 2023 Mar 22 0045 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 Mar 22 0045 UTC Valid To: 2023 Mar 22 0600 UTC Warning Condition: Onset 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.

Issue Time: 2023 Mar 21 2159 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Mar 22: None (Below G1) Mar 23: None (Below G1) Mar 24: G2 (Moderate) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT 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.

Issue Time: 2023 Mar 20 1512 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 Mar 20 1459 UTC Synoptic Period: 1200-1500 UTC Active Warning: Yes 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.

Issue Time: 2023 Mar 20 1453 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 Mar 20 1453 UTC Valid To: 2023 Mar 21 0900 UTC Warning Condition: Onset 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.

Issue Time: 2023 Mar 18 0750 UTC ALERT: Type IV Radio Emission Begin Time: 2023 Mar 18 0722 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.

Issue Time: 2023 Mar 15 2331 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4315 Valid From: 2023 Mar 14 0422 UTC Now Valid Until: 2023 Mar 16 1200 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 15 2322 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2023 Mar 15 2322 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes NOAA Scale: G2 - Moderate 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.

Issue Time: 2023 Mar 15 2321 UTC WARNING: Geomagnetic K-Index of 6 expected Valid From: 2023 Mar 15 2315 UTC Valid To: 2023 Mar 16 0600 UTC Warning Condition: Onset NOAA Scale: G2 - Moderate 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.

Issue Time: 2023 Mar 15 2246 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 Mar 15 2246 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes NOAA Scale: G1 - Minor 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.

Issue Time: 2023 Mar 15 2245 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2023 Mar 15 2242 UTC Valid To: 2023 Mar 16 0600 UTC Warning Condition: Onset NOAA Scale: G1 - Minor 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.

Issue Time: 2023 Mar 15 1136 UTC SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu Begin Time: 2023 Mar 14 1155 UTC Maximum Time: 2023 Mar 15 0425 UTC End Time: 2023 Mar 15 0535 UTC Maximum 10MeV Flux: 22 pfu NOAA Scale: S1 - Minor 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.

Issue Time: 2023 Mar 15 0455 UTC SUMMARY: Geomagnetic Sudden Impulse Observed: 2023 Mar 15 0428 UTC Deviation: 55 nT Station: FRD Potential 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.

Issue Time: 2023 Mar 15 0425 UTC EXTENDED WARNING: Geomagnetic K-Index of 6 expected Extension to Serial Number: 472 Valid From: 2023 Mar 15 0400 UTC Now Valid Until: 2023 Mar 15 1500 UTC Warning Condition: Onset 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.

Issue Time: 2023 Mar 15 0425 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4314 Valid From: 2023 Mar 14 0422 UTC Now Valid Until: 2023 Mar 15 2359 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 15 0425 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1753 Valid From: 2023 Mar 15 0347 UTC Now Valid Until: 2023 Mar 15 1800 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 15 0407 UTC WARNING: Geomagnetic Sudden Impulse expected Valid From: 2023 Mar 15 0430 UTC Valid To: 2023 Mar 15 0530 UTC IP Shock Passage Observed: 2023 Mar 15 0348 UTC 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.

Issue Time: 2023 Mar 15 0356 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 Mar 15 0355 UTC Synoptic Period: 0300-0600 UTC Active Warning: Yes NOAA Scale: G1 - Minor 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.

Issue Time: 2023 Mar 15 0347 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2023 Mar 15 0347 UTC Valid To: 2023 Mar 15 1200 UTC Warning Condition: Onset NOAA Scale: G1 - Minor 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.

Issue Time: 2023 Mar 14 2323 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4313 Valid From: 2023 Mar 14 0422 UTC Now Valid Until: 2023 Mar 15 1200 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 14 2044 UTC EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected Extension to Serial Number: 497 Valid From: 2023 Mar 14 1105 UTC Now Valid Until: 2023 Mar 15 1200 UTC Warning Condition: Persistence Predicted NOAA Scale: S1 - Minor Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2023 Mar 14 1459 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4312 Valid From: 2023 Mar 14 0422 UTC Now Valid Until: 2023 Mar 14 2359 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 14 1211 UTC ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu Begin Time: 2023 Mar 14 1155 UTC NOAA Scale: S1 - Minor Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2023 Mar 14 1202 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 Mar 14 1159 UTC Synoptic Period: 0900-1200 UTC Active Warning: Yes 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.

Issue Time: 2023 Mar 14 1106 UTC WARNING: Proton 10MeV Integral Flux above 10pfu expected Valid From: 2023 Mar 14 1105 UTC Valid To: 2023 Mar 14 2359 UTC Warning Condition: Onset Predicted NOAA Scale: S1 - Minor Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2023 Mar 14 0421 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 Mar 14 0422 UTC Valid To: 2023 Mar 14 1500 UTC Warning Condition: Onset 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.

Issue Time: 2023 Mar 14 0022 UTC SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu Begin Time: 2023 Mar 13 0745 UTC Maximum Time: 2023 Mar 13 0910 UTC End Time: 2023 Mar 13 2359 UTC Maximum 10MeV Flux: 13 pfu NOAA Scale: S1 - Minor Comment: Levels remain near event threshold, albeit on a gradual, downward trend. There is a chance levels could increase back above threshold, which would require a new warning. 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.

Issue Time: 2023 Mar 13 1722 UTC EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected Extension to Serial Number: 495 Valid From: 2023 Mar 13 0745 UTC Now Valid Until: 2023 Mar 13 2359 UTC Warning Condition: Persistence Predicted NOAA Scale: S1 - Minor Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2023 Mar 13 0755 UTC ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu Begin Time: 2023 Mar 13 0750 UTC NOAA Scale: S1 - Minor Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2023 Mar 13 0746 UTC WARNING: Proton 10MeV Integral Flux above 10pfu expected Valid From: 2023 Mar 13 0745 UTC Valid To: 2023 Mar 13 1800 UTC Warning Condition: Onset Predicted NOAA Scale: S1 - Minor Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2023 Mar 12 1127 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Mar 13: None (Below G1) Mar 14: None (Below G1) Mar 15: G1 (Minor) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT 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.

Issue Time: 2023 Mar 10 1543 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3306 Begin Time: 2023 Feb 28 2155 UTC Yesterday Maximum 2MeV Flux: 1943 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2023 Mar 10 0555 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4310 Valid From: 2023 Mar 10 0038 UTC Now Valid Until: 2023 Mar 10 1200 UTC Warning Condition: persistence 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.

Issue Time: 2023 Mar 10 0115 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 Mar 10 0106 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes 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.

Issue Time: 2023 Mar 10 0038 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 Mar 10 0038 UTC Valid To: 2023 Mar 10 0600 UTC Warning Condition: Onset 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.

Issue Time: 2023 Mar 09 1444 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4308 Valid From: 2023 Mar 09 0437 UTC Now Valid Until: 2023 Mar 09 1800 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 09 0841 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2023 Mar 09 0840 UTC Valid To: 2023 Mar 09 1500 UTC Warning Condition: Onset NOAA Scale: G1 - Minor 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.

Issue Time: 2023 Mar 09 0738 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 Mar 09 0737 UTC Synoptic Period: 0600-0900 UTC Active Warning: Yes 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.

Issue Time: 2023 Mar 09 0632 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3305 Begin Time: 2023 Feb 28 2155 UTC Yesterday Maximum 2MeV Flux: 4294 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2023 Mar 09 0438 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 Mar 09 0437 UTC Valid To: 2023 Mar 09 1500 UTC Warning Condition: Onset 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.

Issue Time: 2023 Mar 08 0502 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3304 Begin Time: 2023 Feb 28 2155 UTC Yesterday Maximum 2MeV Flux: 2819 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2023 Mar 07 0853 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4306 Valid From: 2023 Mar 04 2225 UTC Now Valid Until: 2023 Mar 07 1800 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 07 0521 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3303 Begin Time: 2023 Feb 28 2155 UTC Yesterday Maximum 2MeV Flux: 3790 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2023 Mar 06 2304 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4305 Valid From: 2023 Mar 04 2225 UTC Now Valid Until: 2023 Mar 07 0900 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 06 1111 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4304 Valid From: 2023 Mar 04 2225 UTC Now Valid Until: 2023 Mar 06 2359 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 06 0508 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3302 Begin Time: 2023 Feb 28 2155 UTC Yesterday Maximum 2MeV Flux: 6751 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2023 Mar 06 0338 UTC SUMMARY: X-ray Event exceeded M5 Begin Time: 2023 Mar 06 0208 UTC Maximum Time: 2023 Mar 06 0228 UTC End Time: 2023 Mar 06 0235 UTC X-ray Class: M5.8 Location: N18W67 NOAA Scale: R2 - Moderate Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth. Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

Issue Time: 2023 Mar 06 0317 UTC SUMMARY: 10cm Radio Burst Begin Time: 2023 Mar 06 0235 UTC Maximum Time: 2023 Mar 06 0243 UTC End Time: 2023 Mar 06 0256 UTC Duration: 21 minutes Peak Flux: 460 sfu Latest Penticton Noon Flux: 180 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.

Issue Time: 2023 Mar 06 0315 UTC ALERT: Type IV Radio Emission Begin Time: 2023 Mar 06 0238 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.

Issue Time: 2023 Mar 06 0227 UTC ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2023 Mar 06 0224 UTC NOAA Scale: R2 - Moderate 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.

Issue Time: 2023 Mar 05 2357 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4303 Valid From: 2023 Mar 04 2225 UTC Now Valid Until: 2023 Mar 06 1200 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 05 2159 UTC SUMMARY: X-ray Event exceeded M5 Begin Time: 2023 Mar 05 2129 UTC Maximum Time: 2023 Mar 05 2136 UTC End Time: 2023 Mar 05 2141 UTC X-ray Class: M5.0 Location: N18W64 NOAA Scale: R2 - Moderate Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth. Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

Issue Time: 2023 Mar 05 2136 UTC ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2023 Mar 05 2135 UTC NOAA Scale: R2 - Moderate 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.

Issue Time: 2023 Mar 05 1052 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4302 Valid From: 2023 Mar 04 2225 UTC Now Valid Until: 2023 Mar 05 2359 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 05 0501 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3301 Begin Time: 2023 Feb 28 2155 UTC Yesterday Maximum 2MeV Flux: 1698 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2023 Mar 04 2230 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 Mar 04 2230 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes 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.

Issue Time: 2023 Mar 04 2225 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 Mar 04 2225 UTC Valid To: 2023 Mar 05 1200 UTC Warning Condition: Onset 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.

Issue Time: 2023 Mar 04 1634 UTC SUMMARY: X-ray Event exceeded M5 Begin Time: 2023 Mar 04 1519 UTC Maximum Time: 2023 Mar 04 1557 UTC End Time: 2023 Mar 04 1626 UTC X-ray Class: M5.2 Location: N25W85 NOAA Scale: R2 - Moderate Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth. Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

Issue Time: 2023 Mar 04 1553 UTC ALERT: Type IV Radio Emission Begin Time: 2023 Mar 04 1530 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.

Issue Time: 2023 Mar 04 1552 UTC ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2023 Mar 04 1551 UTC NOAA Scale: R2 - Moderate 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.

Issue Time: 2023 Mar 04 1546 UTC ALERT: Type II Radio Emission Begin Time: 2023 Mar 04 1531 UTC Estimated Velocity: 815 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.

Issue Time: 2023 Mar 04 1007 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3300 Begin Time: 2023 Feb 28 2155 UTC Yesterday Maximum 2MeV Flux: 1400 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2023 Mar 04 0537 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4300 Valid From: 2023 Mar 02 2320 UTC Now Valid Until: 2023 Mar 04 1500 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 03 2008 UTC SUMMARY: X-ray Event exceeded X1 Begin Time: 2023 Mar 03 1742 UTC Maximum Time: 2023 Mar 03 1752 UTC End Time: 2023 Mar 03 1759 UTC X-ray Class: X2.1 Optical Class: 1b Location: N25W70 NOAA Scale: R3 - Strong 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.

Issue Time: 2023 Mar 03 1847 UTC WARNING: Proton 10MeV Integral Flux above 10pfu expected Valid From: 2023 Mar 03 1850 UTC Valid To: 2023 Mar 03 2050 UTC Warning Condition: Onset Predicted NOAA Scale: S1 - Minor Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2023 Mar 03 1833 UTC ALERT: Type IV Radio Emission Begin Time: 2023 Mar 03 1753 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.

Issue Time: 2023 Mar 03 1832 UTC ALERT: Type II Radio Emission Begin Time: 2023 Mar 03 1753 UTC Estimated Velocity: 247 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.

Issue Time: 2023 Mar 03 1831 UTC SUMMARY: 10cm Radio Burst Begin Time: 2023 Mar 03 1749 UTC Maximum Time: 2023 Mar 03 1751 UTC End Time: 2023 Mar 03 1803 UTC Duration: 14 minutes Peak Flux: 710 sfu Latest Penticton Noon Flux: 169 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.

Issue Time: 2023 Mar 03 1810 UTC ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2023 Mar 03 1749 UTC NOAA Scale: R2 - Moderate 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.

Issue Time: 2023 Mar 03 1702 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Mar 04: None (Below G1) Mar 05: G1 (Minor) Mar 06: G1 (Minor) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT 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.

Issue Time: 2023 Mar 03 1455 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4299 Valid From: 2023 Mar 02 2320 UTC Now Valid Until: 2023 Mar 04 0600 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 03 1327 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3299 Begin Time: 2023 Feb 28 2155 UTC Yesterday Maximum 2MeV Flux: 3375 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2023 Mar 03 0504 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4298 Valid From: 2023 Mar 02 2320 UTC Now Valid Until: 2023 Mar 03 1500 UTC Warning Condition: Persistence 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.

Issue Time: 2023 Mar 02 2349 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 Mar 02 2345 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes 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.

Issue Time: 2023 Mar 02 2320 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 Mar 02 2320 UTC Valid To: 2023 Mar 03 0600 UTC Warning Condition: Onset 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.

Issue Time: 2023 Mar 02 1809 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Mar 03: None (Below G1) Mar 04: None (Below G1) Mar 05: G1 (Minor) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT 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.

Issue Time: 2023 Mar 02 0556 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3298 Begin Time: 2023 Feb 28 2155 UTC Yesterday Maximum 2MeV Flux: 3730 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Site Affiliations

CWOP (N6ZQK) NWS AT046