Merry Christmas! Many will have mixed feelings about today. It will be a very active weather day so it will ruin many outdoor plans and will make travel hazardous, particulary in the mountains. On the other hand, we need more rain & snow. So look at this as a gift from Santa.
The storm system is a low pressure system dropping in from the Gulf of Alaska. Rain & snow totals will also be enhanced by an atmospheric river with this system.
Half an inch to an inch of rain will be possible Friday-Saturday in the valley with 1-2 feet of snow in many mountain locations. Snow levels start low for most, then rise.
I recommend steering away from mountain travel, but if you have no other choice, please bring plenty of supplies and carry chains with you. You will likely need to use them.
A WINTER STORM WARNING is in effect in the montains from Christmas Day to Saturday.
On the bright side, most in the mountains should see a white Christmas.
High will be in the low-50s to upper-40s in the valley Christmas Day with breezy winds, making it feel even colder.
A low pressure system will land in central California, but also do so while coming in from the northwest. This will allow showers & snow to move in as it brushes our area on Sunday.
A few showers will be leftover from this system on Monday morning, with more showers south and more sunshine north.
Tuesday we should only see isolated showers with highs still in the 50s.
Wednesday through Thursday an atmospheric river impacts our region. The main part of the rain & snow will be focused on Oregon but our area should still see scattered to numerous showers & snow Wednesday-Thursday.