![G3 Watch for 6-7 Sep CME Arrival](https://www.swpc.noaa.gov/sites/default/files/styles/pad_sides_large/public/top_news/G3_watch_6-7Sep.jpg?itok=c7Pc11Hq)
G3 Watch for 6 and 7 September, 2017 due to CME Arrival
The geomagnetic storm watch for the 6 and 7 September, 2017 UTC-days has been upgraded to G3 (Strong). The G3 Watch is in anticipation of the expected arrival of a coronal mass ejection (CME) that took place in association with an M5 flare (R2-Moderate radio blackout) observed on 4 September at 2033 UTC (1633 ET). Current analysis and forecasts reflect CME arrival late on 6 September, 2017; with CME effects continuing into 7 September. Keep checking our SWPC website for updates to the forecast.