G1 – Minor Geomagnetic Storm Watch issued for September 8 and 9, 2026

A G1 – Minor Geomagnetic Storm Watch was issued at 16:35 UTC on September 7, 2026. According to the latest alert from NOAA’s Space Weather Prediction Center, G1 – Minor level geomagnetic storm conditions are predicted for both September 8 and 9, 2026. No storms above G1 – Minor are forecast, and the Watch supersedes all prior watches in effect.

Potential impacts from this event are expected primarily poleward of 60 degrees geomagnetic latitude. Weak power grid fluctuations may occur due to induced currents, and there is a possibility of minor impacts on satellite operations. Auroras may be visible at high latitudes, including the northern tier of the United States such as northern Michigan and Maine. These effects are consistent with typical G1 – Minor geomagnetic storm conditions as classified by NOAA.

According to the latest forecast discussion from SWPC, several coronal mass ejections (CMEs) observed over the past 24-36 hours are expected to arrive early on September 8 into September 9. These events, in combination with a coronal hole high speed stream (CH HSS), are anticipated to enhance solar wind conditions and lead to the forecasted geomagnetic activity on these dates. The timing and magnitude of CME arrivals remain somewhat uncertain, but isolated G1 – Minor storm periods are considered likely during this time frame.