San Francisco Bay Area Weather Forecast (Including Santa Cruz County) – (1 to 2 days) Mostly clear today becoming partly cloudy tonight and Tuesday.     Light northerly winds.   High temperatures in the high 50’s to low 60’s.   Low temperature mostly in the mid 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 – (12/20/17-12/24/17) –  Showers likely in the north and a chance of showers south to Monterey Tuesday night with a decreasing chance of morning showers on Wednesday, except for continuing snow showers in the mountains.  Snow level in the mountains lowering 5000 feet or lower on Wednesday. Mostly clear Wednesday night through Friday becoming partly cloudy Friday night through Sunday. High temperatures in the high 50’s to low 60’s.   Low temperatures mostly in the mid 30’s to mid 40’s.  

Long Range Weather Outlook Northern and Central California 8 to 15 days (12/25/17 – 12/31/17)   Mostly fair weather is expected at the beginning of the period with a chance of rain later in the period.  Temperatures cooler than normal during the period.

Extremely Long Range Weather Outlook Northern and Central California 16 to 20 days (01/01/08 – 01/04/18)  Chance of rain at times later in the period.  Cooler than normal temperatures.

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Short Term Weather 1 to 7 day Forecast Discussion    High pressure will build temporarily into California for the next several days before cold weather system drops south over Northern and Central California with a snow showers likely over the mountains with a good chance of light rain or showers over coastal areas from Monterey Bay north on Tuesday night.  This disturbance will be fast moving and bring a little cooler weather south over California around midweek. The weather will return to mostly dry weather by Wednesday night as high pressure builds into the states that will continue through the end of the week.  

Northern and Central California 8 to 15 day extended forecast  The latest computer models are showing the west coast high pressure ridge weakening later in the period and allowing a weak weather system to reach the state later in the period but the stubborn ridge still appears to be keeping the weather mostly dry through the holidays, but the computer projections are still being inconsistent from run to run,  so this long range forecast will continuely need to be updated. Temperatures will be near to below above normal.

Northern and Central California 16 to 20 day extended forecast – The latest computer models are showing a split jet stream off the west coast with increased energy reaching the the Pacific Northwest from the northern jet stream and energy a chance of rain to the southern border of California from the southern jet stream, but this is still quite far out in the forecast, so stay tuned. Temperatures will average near normal during the period.  

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