G2 – Moderate Geomagnetic Storm Watch issued for September 9, 2026

A G2 – Moderate Geomagnetic Storm Watch was issued for September 9, 2026. The Watch was released by the NOAA Space Weather Prediction Center at 21:01 UTC, indicating the potential for geomagnetic storm activity reaching the G2 – Moderate level on this date.

Potential impacts from a G2 – Moderate Geomagnetic Storm include power grid fluctuations and possible voltage alarms for high-latitude power systems. Satellite operations may experience orientation irregularities while increased atmospheric drag on low Earth-orbit satellites is possible. High-frequency (HF) radio propagation can be affected at higher latitudes, leading to signal fading. Additionally, auroras may be visible as far south as New York, Wisconsin, and Washington state for the duration of the event. These effects are expected to occur primarily poleward of 55 degrees geomagnetic latitude.

According to the latest SWPC forecast discussion issued on September 9, 2026, G1-G2 (Minor-Moderate) geomagnetic storms are likely on September 9. The triggering factors include ongoing positive polarity coronal hole high speed stream influences, as well as the anticipated arrival of coronal mass ejections that left the Sun on September 5 and 6, 2026.