March 10, 2020 – Shower chances possible into mid-week south of Sacramento. Dry and warm to end the week. Cooler weather with rain chances return during the weekend.
Discussion
Skies are clear across most of NorCal early this morning, though the deep closed low off the coast to our southwest continues to send some mid and high clouds northward across areas south of Sacramento. Current temperatures range from the upper 20s to mid 30s in the mountain valleys, to the mid 40s to lower 50s across the Central Valley.
The offshore low will move toward central and southern California later today and Wednesday. Some light showers may make it as far north as the extreme southern portion of the forecast area. The remainder of the region will remain dry with breezy northerly wind.
Upper level ridging builds in on Thursday resulting in additional warming heading into the weekend.
Extended Discussion (Saturday through Tuesday)
Cold upper low slowly slides down the West Coast over the weekend bringing a threat of widespread precipitation to interior NorCal. Model QPFs are trending wetter with this system and could result in significant snow in the mountains of Western Plumas county and the Northern Sierra Nevada. Snow levels lower into the upper foothills by Sunday morning. Will need to monitor forecast instabilities as 5H temps progged around in the -30 to -34 Deg C Sunday.
Low continues to influence our weather early next week as it slowly digs off the CA coast with multiple vorticity maxima rotating around it. This will keep unsettled weather in the forecast with slightly below normal daytime temperatures.