The heaviest of the rain and snow showers have already made their way through Northern California today, but lighter showers will linger into your evening. A Winter Weather Advisory is in effect for portions of the Sierra and Cascades above 4500' through 10pm tonight. The biggest impact will likely be slick roads from the snow. Some visibility issues will also be possible this evening, so please be careful if you do need to be out on the roads. Snow levels started out at around 2000' for most of our region this morning, but will be i nthe 4500' to 5500' range tonight. Temperatures are expected to drop into the high 30's to mid 40's in the valley overnight, and mountain areas will end up in the high 20's to low 30's on Thursday morning.
The next round of showers is expected to arrive early Thursday morning across the Northwest corner of the state and will spread across the remiander of our region Tomorrow afternoon. Snow levels will be up in the 5500' to 6000' range on Thursday. The heaviest rain and snow is expected to be in the Northern end of the valley and in the Northern Mountains tomorrow. Temepratures will top out in the low to mid 50's in the valley and in the low 40's in most mountain areas. The potential for showers will linger in the Northern Mountains and in Shasta County on Friday morning, but it looks like the rest of our region can expect a short break from the wet weather for the end of your work week.
The next round of rain and snow arriving on Saturday is expected to be heavier and will likely bring bigger travel impacts to our region this weekend. Showers will start out in the Northwest corner of the state and will spread through the remainder of Northern California through the day. This could be a slow spread of wet weather through the day on Saturday, with some models holding off on the chance for showers in the Sierra until Saturday evening. Snow levels will be in the 5000' to 6000' range on Saturday and will drop into the 4000' to 5000' range on Sunday. Valley areas are currently projected to get anywhere between a half an inch to two inches of rain in your weekend forecast. 5 to 12 inches of snow is currently in the forecast for areas above 4000' this weekend, with some locally higher amounts possible in areas like Lassen Park. Mountain travel impacts will be likely as we head through your weekend, and chain controls will be possible. There is potential for showers to linger across Northern California on Monday, with the best chance for wet weather resting in the higher elevations. It looks like we'll see a break from the wet weather for Christmas Eve on Tuesday, but more active weather could be returning on Christmas Day.