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Displaying AFOS PIL: ALTK08 Received: 2023-04-23 19:51 UTC
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453 WOXX15 KWNP 231951 ALTK08 Space Weather Message Code: ALTK08 Serial Number: 27 Issue Time: 2023 Apr 23 1945 UTC ALERT: Geomagnetic K-index of 8, 9- Threshold Reached: 2023 Apr 23 1944 UTC Synoptic Period: 1800-2100 UTC Active Warning: Yes NOAA Scale: G4 - Severe www.swpc.noaa.gov/noaa-scales-explanation 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. # Issued by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Recent messages, data, and help at http://swpc.noaa.gov/alerts/ # Send questions to SWPC.Webmaster@noaa.gov