December 26, 2016 – Dry weather with cold overnight temperatures and morning Valley fog through the work week.
Discussion
Mostly clear skies across interior Northern California under dry northwesterly flow aloft. Strong radiational cooling brought another cold night across the region, with temperatures bottoming out in the mid to upper 20s across the Valley, and teens and single digits over the mountains.
Cool and dry weather will be prevalent this week, though a weak system passing to the north may bring a few light showers to the northern mountains on Tuesday. Overnight lows are expected to be a little milder tonight as some cloudiness increases ahead of Tuesday’s system, though minimums will once again dip down into the upper 20s across portions of the Central Valley. Milder temperatures are expected by mid-week.
Extended discussion (Friday through Monday)
Fairly dry weather expected Friday as our region sits between a closed upper low to the south and weak wave to the north. Models still not in great agreement on whether an inside slider will impact the region Friday night into Saturday morning (GFS says yes, ECMWF says no). Both models do show NorCal being fairly dry Saturday afternoon through Sunday afternoon. Then both models show a more active wet pattern starting Monday, but there is low confidence in the details.