San Francisco Bay Area Weather Forecast (Including Santa Cruz County) – (1 to 2 days)   Mostly sunny today.  Mostly clear tonight becoming mostly cloudy in the north bay and partly cloudy in the south bay on Sunday.  Light winds.  High temperatures in the low 60’s.  Low temperature mostly in the low 40’s.  

Extended Forecast for Central California (Including Napa County south to Monterey County and east into the Sierras –  (3 to 7 days – (11/20/17-11/24/17) – Mostly cloudy with an increasing chance of rain in the north Sunday night.  Mostly cloudy with rain likely in the north and a chance of rain further south on Monday. Mostly cloudy with a chance of showers north of the Golden gate Monday night with a slight chance of rain further south, otherwise partly cloudy in the south.  Mostly cloudy on Tuesday with a decreasing chance of showers in the north, otherwise partly cloudy in the south. Mostly cloudy with a slight chance of rain in the north otherwise partly cloudy in the south Tuesday night and Wednesday.  Partly cloudy Wednesday night through Friday.  High temperatures in the high 50’s to low 60’s.   Low temperatures mostly in the low 40’s. 

Long Range Weather Outlook Northern and Central California 8 to 15 days (11/25/17 – 12/01/17)  Partly cloudy at the beginninog of the period then a chance of rain developing over much of the area later in the period.   Temperatures near normal.

Extremely Long Range Weather Outlook Northern and Central California 16 to 20 days (12/02/07 – 12/06/17)  Rain at times in the north and a chance of rain in the south at times.  Normal temperatures.

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Short Term Weather 1 to 7 day Forecast Discussion   A high pressure ridge will build into the state over the next several days that will bring mostly fair weather to most of California, although clouds will begin to increase over the north on Sunday ahead of a trough developing in the eastern Pacific. Computer models are suggesting that moisture from this system will reach Northern California Sunday night and Monday with the tail end of a warm front moving into mostly the north bay on Monday. Rainfall amounts with this next system will be much less than Thursday’s storm and the southern extent of the rain is still uncertain.   The weather for the Thanksgiving week is still somewhat in doubt as the computer models are showing run to run differences, but the weather is expected to be unsettled with rain at times continuing in the far north, but mainly partly cloudy weather over Central California as the high pressure ridge over the southwestern Unitied States holds.   Further out in time, the ridge is expected to weaken after the Thanksgiving weekend with the chance of rain increasing the following week. 

Northern and Central California 8 to 15 day extended forecast  The computer models are showing the jet stream further north into the Pacific Northwest at the beginning of the period with a chance of rain in the far north and partly  cloudy weather over central California then the jet stream may again shift further south later in the period with a rain developing over much of the north half of the state later in the period.  Slightly warmer than normal temperatures are expected at the beginning of the period then cooling later in the period.

Northern and Central California 16 to 20 day extended forecast – The latest computer models are showing a trough developing off the California coast that could bring periods of rain for the northern half of California with a chance of rain in much of Central California. Temperatures will average near normal during the period.  

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