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October 17, 2017 – Dry weather thru mid-week. Rain chances along with high mountain snow and cooler temperatures late in the week followed by a warming trend this weekend.

Discussion

Varying amounts of high cloudiness moving across NorCal with westerly flow across the region. Temperatures are up a bit compared to 24 hours ago and winds are generally light.

Dry weather continues the next couple of days with mild days and cool nights. Periods of high clouds will be possible as the weak wave moves through today, and more high cloudiness is likely the next couple of days as moisture spreads northward from the subtropical low pressure system offshore.

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Low pressure system diving southeast from the Aleutians is forecast to deepen a trough along the West Coast Thursday into Friday bringing cooler and breezier conditions. Models continue to trend drier and further north with QPF with much of it occurring along the cold front as it moves south Thursday night and early Friday. Amounts vary from 1/4 to 1/2 inch over the mountains to a few hundredths of an inch around Sacramento to less than 1/4 inch near Redding. Higher mountain elevations may see a few inches of snow accumulation.

Extended discussion (Saturday through Tuesday)

The upper trough pushes east and weakens Friday night into Saturday morning making way for drier and warmer weather over the weekend. Daytime highs in the Valley will warm into the upper 70s and low 80s by Sunday. For the foothills and mountains, Sunday highs will rise to the 60s to mid 70s. Dry weather with additional warming for the beginning of next week.