Grab that sweater and be prepared for a much cooler day across northern California. Some of you may also want to get an umbrella handy, but may not end up needing it today. Low pressure tracking into the Pacific Northwest will usher in partly to mostly cloudy skies, scattered mountain showers, cooler temperatures, and breezy south winds into northern California Wednesday. We have a blanket of clouds over our region this morning, and I'm tracking showers through our far northern zones to start the day. More scattered mountain and foothill showers will be possible through your Wednesday, but valley areas are expected to stay mostly dry. The exception is Redding, where light showers will be possible early today. Temperatures are starting out in the 50's to lower 60's in the valley and foothills this morning, and mountain areas are mostly in the 30's to 40's to start the day. Winds are out of the southeast to 15mph across most of our region this morning, and will stay in that range through this evening. Locally stronger wind gusts are expected in the northern Sierra and Southern Cascades this afternoon. Gusts up to around 30mph out of the southwest will be possible in Modoc, Lassen, and Plumas Counties late today. Humidity is expected to stay higher this afternoon, and is only projected to bottom out in the 30 to 40 percent range. That's very positive news for our fire danger, as the more moisture we have in our atmospher the harder it is for fires to start and spread. High temperatures will end up in the low to mid 70's in the valley, and mid 50's to upper 60's in the foothills and mountains this afternoon.
Our forecast will stay fairly similar through Friday, with a few exceptions. Winds are not expected to be as strong late week, temperatures will continue to cool through Friday, and overnight low temperatures will end up much cooler as we get closer to the weekend. Scattered mountain showers will be likely through Friday night, and we'll even have a slight chance for some wet weather in the valley on Friday. Friday will also be the peak of the cooling for this week, with valley areas projected to top out in the mid to upper 60's. Foothill and mountain areas will top out in the 50's to low 60's by Friday. Overnight low temperatures are porjected to dip into the 40's in the valley later this week, while mountain areas bottom out in the 20's to 30's. This will mean you'll want to bundle up for the morning hours through this weekend.
High pressure is projected to build back into northern California through this weekend, and that will result in dry conditions, sunny skies, and a very modest warming trend from Saturday through Sunday. Low temperatures will still be very chilly, but high temperatures will wamr by several degrees from Friday through Sunday. Valley areas are projected to end up in the mid 70's on Saturday, and 70's to lower 80's on Sunday afternoon. Mountain and foothill areas will have high tmeperatures in the 60's to lower 70's through this weekend. The next wet and cooler system will move into our region early next week, and will bring some concerning impacts. Temperatures will be much cooler for the start of next week, with valley areas dipping back into the mid to upper 60's on Monday. We'll also have the potential for scattered mountain showers, but also gusty north winds that will make fire danger a big concern early in the week. The current projection gives us the strongest north winds on Monday, with winds staying fairly breezy on Tuesday. We'll stay cool, with the potential for light showers through the middle of next week's forecast.