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

A G2 – Moderate Geomagnetic Storm Watch was issued by NOAA SWPC for September 9, 2026. The Watch, issued at 17:02 UTC on September 8, 2026, indicates that G1 – Minor storm conditions are likely on September 8, followed by G2 – Moderate conditions on September 9 before activity drops below storm levels on September 10. This Watch supersedes all previously issued watches.

According to NOAA SWPC, the main area of impact is expected to be poleward of 55 degrees geomagnetic latitude. Potential impacts include power grid fluctuations and possible voltage alarms in high-latitude power systems, orientation irregularities and increased atmospheric drag for satellites in low Earth orbit, and fading of high-frequency (HF) radio propagation at higher latitudes. Auroral displays may be visible as far south as New York, Wisconsin, and Washington state.

The current geomagnetic activity has been triggered by enhanced solar wind conditions associated with a positive polarity coronal hole high speed stream (CH HSS), as well as the anticipated arrival of coronal mass ejections (CMEs) that left the Sun on September 5 and 6. The NOAA SWPC forecast discussion notes that G1 – Minor geomagnetic storms are likely through September 9 due to these combined factors, with quieter conditions expected to return on September 10 as the disturbances subside.