Get ready for another active day across northern California. Low pressure off the coast will continue to push moisture into our region today. Valley and foothill areas can expect rain, and a chance for thunderstorms today. Mountain areas can expect rain and snow. A Winter Storm Warning remains in effect through 6am Wednesday in the Sierra, and through 10am this morning in Siskiyou County. A Winter Weather Advisory is in effect for Lassen and Plumas County areas through 4am Wednesday morning. Trinity and Siskiyou County areas will have an additional Winter Weather Advisory go into effect at 10pm tonight and last through 4pm Wednesday. Some of these warnings and advisories may be extended through Wednesday afternoon as snow levels drop. Snow levels will dip to as low as 2500' in the Northern Mountains today, while the Sierra and Southern Cascades are projected to see snow levels dropping down to around 3500' to 4500'. Temperatures are starting out in the 50's for the valley, and 30's to 40's in our mountain and foothill areas this morning. Winds will be out of the south to around 20mph, with gusts up to around 30mph today. High temperatures are projected to end up in the mid 50's to lower 60's in the valley, in the 40's for most foothill areas, and in the 30's to 40's in our mountain areas this afternoon. Heavy snow in the mountains will make travel difficult, and you're advised to stay off the roads today and Wednesday if you can.
More rain and snow are on the way in your Wednesday forecast, and snow levels will drop down to around 2500'. Heaviest rain and snow are expected early in the day, with amounts fizzling out as we head into your Wednesday evening. Temperatures will be several degrees cooler on Wednesday afternoon in most areas.
The storm moves off to our east on Thursday, and we have a big shift on the way in your late week weather pattern. High pressure will build into northern California, and will result in dry and warmer conditions from Thursday through your weekend. The current projections are also showing gusty north winds possible late this week, but it does not look strong enough to issue any kind of a warning at this time. We'll have sunny to mostly sunny skies and above average temperatures from Thursday through this weekend. Valley areas will top out in the low to mid 60's, foothill areas will end up in the 50's to lower 60's, and mountain areas will top out in the 40's to 50's late this week through your weekend. Longer range models are now hinting at the potential for anorther wet system on the way towards the middle of next week, but that is still pretty far off and is subject to change.