Space Weather Message Code: WATA50
Serial Number: 70
Issue Time: 2023 Feb 26 1636 UTC
WATCH: Geomagnetic Storm Category G3 Predicted
Highest Storm Level Predicted by Day:
Feb 27: G3 (Strong) Feb 28: G2 (Moderate) Mar 01: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: Combined impacts from the current negative-polarity CH HSS, the anticipated arrival of the 24 Feb CME, and the addition of the
25 Feb CME warrant an increased Geomagnetic Watch readiness to the G3 level.
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.