First G4 Geomagnetic Storm since 2005.
Issue Time: 2024 May 09 1722 UTC
WATCH: Geomagnetic Storm Category G4 or Greater Predicted
Highest Storm Level Predicted by Day:
May 10: G1 (Minor) May 11: G4 (Severe) May 12: G2 (Moderate)

Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents – Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft – Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation – Satellite navigation (GPS) degraded or inoperable for hours.
Radio – HF (high frequency) radio propagation sporadic or blacked out.
Aurora – Aurora may be seen as low as Alabama and northern California.