EXTENDED WARNING: Geomagnetic K-index of 7 or greater expected

Space Weather Message Code: WARK07

Serial Number: 47

Issue Time: 2015 Mar 17 1642 UTC

EXTENDED WARNING: Geomagnetic K-index of 7 or greater expected

Extension to Serial Number: 46

Valid From: 2015 Mar 17 1215 UTC

Now Valid Until: 2015 Mar 17 1900 UTC

Warning Condition: Onset

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.