ALERT: Geomagnetic K-index of 7 (G3) 2021 May 12 1259 UTC (link corrected)

Status Report From: Space Weather Prediction Center (NOAA)
Posted: Wednesday, May 12, 2021

Space Weather Message Code: ALTK07
Serial Number: 115
Issue Time: 2021 May 12 1259 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2021 May 12 1258 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at

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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