Today will be a wet & cool day with widespread showers & thunderstorms. Highs stay in the mid-60s.
A FLASH FLOOD WARNING will take effect at 10am and last through 9pm tonight. There are widespread light to moderate showers this morning which will saturate the ground and lead to possible flooding conditions later in the day as thunderstorms form. Scattered thunderstorms from Chico and North could cause flash flooding concerns with rain rates overall around half an inch per hour but could become over an inch of rain per hour in some thunderstorms. Concerns are potential road flooding, rising creeks/streams, minor mudslides, and possible debris flows near burn scar areas (most notably in Shasta & Butte counties). Thunderstorms could also produce small hail and gusty winds with frequent lightning, on top of the flash flood threat.
A WINTER STORM WARNING is also in effect until Tuesday night for parts of the Sierra above 6000 feet. 2-8 inches of wet snow could fall leading to slippery road conditions, reduced visibility and wind gusts up to 60mph.
After the last of the storms clear tonight, the overnight hours should be fairly quiet. Scattered showers with a few isolated storms will be possible over the Sierra mountains and foothills Tuesday afternoon, but the valley should remain mostly dry. Valley highs should get back in the 70s Tuesday.
Sunny skies and a warming trend settle in for the rest of the week. Highs reach the low-80s on Thursday. Only slightly cooler and cloudier on Friday. Then highs reach the mid-to-upper 80s next weekend.