Dry and relatively mild weather to end the year

December 31, 2019 – Dry weather this week with the exception of some showers in far northern California mid-week. Slightly above average temperatures prevail. Chances for precipitation return this weekend.

Discussion

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Closed low now off the coast of Baja as ridging from the eastern Pacific noses into NorCal. Still a decent north to east surface gradient hanging on across the region, though they`ve come down a bit from their highs Monday afternoon and evening. Sites across the Sacramento Valley, particularly in the north and along the west side, still reporting gusts in the teens while local northeasterly gusts of 25-40 mph are occurring in the foothills and mountains. A big contrast in temps with the windier spot of Vacaville currently 57 while Modesto with much lighter wind is 37.

Some patches of fog will be possible early this morning in the Central Valley from about the Sacramento area southward where winds are relatively light and the surface is nearing saturation. North winds will likely inhibit much fog development further to the north.

Dry conditions are expected to predominate for the remainder of the week with the exception of some shower chances across the northern mountains on Wednesday as a short-wave clips the area.

Some lingering breeziness is expected this morning, then lighter winds are expected as gradients slacken. Temperatures will be slightly above average with mostly sunny or partly cloudy skies each day heading into the new year/decade.

Extended Discussion (Saturday through Tuesday)

Ensemble guidance, along with models, show a weak trough passing over the PacNW on Saturday which could bring some showers to areas north of I-80. Snow levels look to be around 5000-6000 feet with this system with minor snow accumulation being possible at pass level. Ridging builds back in behind this system which will bring dry weather to the region through early next week.