WARNING: Geomagnetic K-index of 7 or greater (G3 or Greater)2021 May 12 1249 UTC

Status Report From: Space Weather Prediction Center (NOAA)

Posted: Wednesday, May 12, 2021

Space Weather Message Code: WARK07

Serial Number: 77

Issue Time: 2021 May 12 1249 UTC

WARNING: Geomagnetic K-index of 7 or greater expected

Valid From: 2021 May 12 1250 UTC

Valid To: 2021 May 12 1800 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.

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