Clouds have been increasing across Northern California today, but we've stayed hot. Valley areas ended up in the 90's this afternoon, foothil areas ended up in the low to mid 80's and mountain areas ended up in the 80's to 90's. Winds have been picking up out of the South and will be up to 25mph tonight. Gusts could reach 35mph out of the South tonight. A big change is on the way for our weather pattern as an area of low pressure tracks up the coast of California tonight. The potential for showers and thunderstorms will be returning to our region this evening, with heavier rain and thunderstorms picking up after midnight. The heavy rain on the way has prompted the National Weather Sevice out of Sacramento to issue a Flash Flood Watch for areas of Shasta, Tehama, and Glenn Counties from 6am through 8pm on Saturday. A Flash Flood Watch will be in effect for Trinity County from Saturday morning through Saturday afternoon.
Heavy rain, thunderstorms, gusty winds, and much cooler temperatures are all expected in your Saturday forecast across Northern California. The heaviest rain is expected overnight through early Saturday and then we'll have more scattered rain and thunderstorms in the afternoon and evening. Portions of Shasta, Tehama, Trinity, and Siskiyou Counties will more than likely see the heaviest rainfall, with up to a half inch of rain falling an hour at some times. Between 1 to 2 inches of rain will be possible in our region from late Friday night through early Sunday morning. We'll also have the potential for hail with the thunderstorms on Saturday afternoon. Temperatures will dip into the 60's in the valley overnight and will only climb into the 60's to low 70's on Saturday afternoon. Foothill areas will start out in the 50's to low 60's, and will end up in the mid 60's on Saturday afternoon. Mountain areas will dip into the 40's overnight and will end up in the 50's to 60's tomorrow afternon. Sustained winds will be up to around 25mph out of the South, and we'll have gusts up to around 35mph.
The area of low pressure that is bringing the active and cooler weather to our region on Saturday is expected to track North into the Pacific Northwest on Sunday. Northern California will be partly to mostly cloudy on Sunday and we'll have the potential for some showers and thunderstorms lingering in our region. The best chance for active weather will be in our higher elevations on Sunday. Valley areas are expected to climb back into the low 80's on Sunday afternoon and into the 70's in the mountains and foothills. Another area of low pressure will set up off the West Coast for the start of next week and that will bring another chance for wet weather to our region on Monday into Tuesday. The best chance for showers and thunderstorms will be in higher elevations early next week, but valley areas may have some active weather as well. Temperatures are not expected to change much from Sunday into Monday, but a big jump in high temperatures is expected to arrive on Tuesday. Valley areas will be back in the high 80's to low 90's from Tuesday, and then mid to high 90's are expected on Wednesday and Thursday. Foothill and mountain areas can expect high temperatures in the 80's for the middle of next week. We'll continue to have a slight chance for showers in the mountains through the middle of next week, but valley areas are expected to stay dry. Another wet system is currently projected to arrive in our region towards the end of next week and temperatures are currently projected to dip to just below average on Friday.