San Francisco Bay Area Weather Forecast (Including Santa Cruz County) – (1 to 2 days)    Mostly clear tonight through Sunday.  Light  winds.  High temperatures in the mid  to upper 60’s  Low temperature in the high 30’s to low 40’s. 

Extended Forecast for Central California (Including Napa County south to Monterey County and east into the Sierras –  (3 to 7 days – (02/18/17-02/22/18) –   Mostly fair Sunday night through Friday except becoming partly cloudy Sunday night through Tuesday with a chance of snow showers at times Sunday night through Monday night.  with a slight chance of showers over coastal areas Sunday night and Monday. Breezy conditions Sunday and Monday, especially over the hills and mountains.  Snow level lowering to near 1500 feet Sunday night and Monday. High temperatures cooling into the high 40’s to low 50’s by early next week.  Low temperatures mostly in the 30’s to low 40’s.  

3P Range Weather Outlook Northern and Central California 8 to 15 days (02/23/18 – 03/02/18)   Mostly fair early in the period but rain or showers at times developing later in the period with a chance of rain or showers at times in the south. Temperatures will average slightly below normal during the period.

Extremely Long Range Weather Outlook Northern and Central California 16 to 20 days (03/03/08 – 03/06/18)  Chance of rain or showers at times during the period.  Slightly below normal temperatures.

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Short Term Weather 1 to 7 day Forecast Discussion   High pressure continues to maintain its grip along or off the west coast of the United States. Several weather systems will drop south later this weekend and early next week and bring partly cloudy and colder weather and a threat of snow showers over the mountains with the snow level expected to drop to around 1000 feet. Snowfall in the Sierras could reach up to 6 inches in isolated locations at the higher elevations. There will be a slight chance of light showers in coastal areas as well Sunday night and Monday.  These systems will bring much colder weather south from Western Canada dropping high temperatures into the 50’s around the Bay Area and low temperatures into the the low 30’s at night.  Northerly winds will become gusty at times especially along the coast and over the higher elevations. The longer range computer models are beginning to trend towards an unsettled weather pattern by the end of the month as the high pressure ridge off the California coast slowly retrogrades far enough off the coast to allow for cold troughs to drop south off the west coast and bring an increasing chance of precipitation.   

Northern and Central California 8 to 15 day extended forecast  The latest computer models are suggesting that a high pressure ridge will hold off the California coast at the beginning of the period bringing mostly fair weather as the jet stream continues from the far north; however later in the period the ridge may retrograde far enough off the coast to allow for weather systems to drop south over California and bring showers at times to most of the state.  Temperatures will average slightly below normal.

Northern and Central California 16 to 20 day extended forecast – The latest computer models are showing a developing trough of low pressure off the northwest coast that could bring rain or showers to the north half of California at times. Temperatures will average slightly below normal during the period.  

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