159 
WOXX14 KWNP 040246
WARK07

Space Weather Message Code: WARK07
Serial Number: 80
Issue Time: 2021 Nov 04 0244 UTC

EXTENDED WARNING: Geomagnetic K-index of 7 or greater expected
Extension to Serial Number: 79
Valid From: 2021 Nov 03 2204 UTC
Now Valid Until: 2021 Nov 04 0900 UTC
Warning Condition: Persistence
www.swpc.noaa.gov/noaa-scales-explanation
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.

# 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