All signs are pointing to an increasingly soggy and windy Tuesday afternoon and evening.
A weather system has yet again pulled in some juicy subtropical moisture from the south coupled with some pretty cold Gulf of Alaska air that should help power up a fairly strong rain and mountain snow event.
For the coastal hills, North Bay and Santa Cruz mountains we'll probably see 2"-4" inches of rain falling from 4pm through 10pm with .75" to 2" inches for lower elevations.
As winds aloft come racing at a nearly perpendicular angle to the coastal ranges - this will likely help to enhance rainfall totals until most of the moisture slides southward along with the cold front by early Wednesday morning.
Much cooler air aloft will begin spilling in on Wednesday - although drier, will help drive down snow levels to near 3,000 ft. for any convective showers that pop up (especially along the hilltops).
Its looking more like we'll be mainly dry from Wednesday night into early Friday - possibly with some frosty consequences if skies clear and winds stay light enough as the chilly Canadian air filters in.
TODAY IN THE BAY: Scattered showers -- winds will start picking up a bit later in the morning.
430PM NEWS: Rain should be increasing - heaviest north of the Golden Gate nearing the time of the strongest winds 15-30 mph range - higher on the coast/hills.
900PM NEWS: Heaviest rain timeframe for the entire Bay Area as cold front begins driving heavier rain line southward. Winds are probably maxing out at this point and should ease some overnight.
11PM NEWS: Accd. to the models - heavy rain may be hung up over the Santa Cruz mountains w/ strong SW flow driving moisture up and over the summit. In this type of pattern San Jose may see moderate rain - but nowhere near as heavy as what Santa Cruz/Ben Lomond/Hwy 17 summit would see. After midnight this heavier rain will begin moving again - down the Big Sur Coast
TODAY IN THE BAY: Heavier rain moving out - but spotty roadway flooding and mountain rockslides in areas are probable (best bet the SC mtns).
Cooler air moving in will decrease the coverage of rain and aid in clearing skies -- however- we'll likely see a few showers lingering into Thursday - mainly coastal hills where snow levels may drop into the 2,500-3,000 ft. range...
The extended forecast appr. New Year's is trying to trend drier - yet probably with some very chilly, frosty mornings ahead...