WARNING: Geomagnetic K-index of 7

Space Weather Message Code: WARK07
Serial Number: 59
Issue Time: 2015 Sep 11 1659 UTC

WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2015 Sep 11 1658 UTC
Valid To: 2015 Sep 11 2100 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater - Strong to Extreme

NOAA Space Weather Scale descriptions can be found at
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.