Scattered to widespread thunderstorms are possible this afternoon into tonight. The highest thunderstorm chances are over Siskiyou, Modoc, Klamath, and Lake counties, with lower chances over Jackson, Josephine, and eastern Douglas counties. Late tonight, activity will gradually shift northward but may linger across portions of southwest Oregon. The main threats will be lightning, hail and strong gusty outflow winds. Remember that lightning is deadly - when you hear thunder, seek substantial, covered shelter and remain there until 30 minutes following the last rumble of thunder.

Isolated to scattered thunderstorms are possible in the afternoon and evening on Thursday and Friday. The highest chances for this activity remains in northern California counties and areas east of the Cascades, with coverage decreasing on Friday.

Thunderstorms produce deadly lightning capable of striking up to 10 miles away from the storm — so, even if you don't see rain you could be in harm’s way. Remember this simple message: When Thunder Roars, Go Indoors!