G2 – Moderate Geomagnetic Storm Watch issued for October 11, 2026

A G2 – Moderate Geomagnetic Storm Watch was issued for October 11, 2026. According to the Space Weather Prediction Center (SWPC), this Watch supersedes any and all prior Watches in effect. The highest storm level currently predicted is G2 – Moderate for October 11, with no geomagnetic storm conditions expected on October 10 or October 12.

Potential impacts include power grid fluctuations, particularly at high geomagnetic latitudes (poleward of 55 degrees). High-latitude power systems may experience voltage alarms. Satellite operators should be aware of the possibility of satellite orientation irregularities and increased drag on low Earth-orbit satellites. High frequency (HF) radio propagation may experience fading at higher latitudes. In addition, aurora may be visible as far south as New York, Wisconsin, and Washington state.

The Watch has been triggered by increased solar activity, including a recent M6.7-class flare from Region 4549 (N10W29) on October 8 at 15:48 UTC. This event was associated with a coronal mass ejection (CME), which is anticipated to impact Earth and result in enhanced geomagnetic activity. SWPC forecasters expect continued enhancements as a negative polarity coronal hole high speed stream becomes geoeffective following the CME, with the possibility of additional disturbances if further solar eruptions are observed.