In the Bay Area, conditions will not be quite as favorable as in the Central Valley, but while
precipitation will probably start out as rain under 2000 feet snow
levels will
drop quickly on the back end of the
precipitation band associated with the cold front, possibly bringing some snow accumulations down to 1000 feet and a brief rain / snow mix to even lower elevations.
The heaviest
precipitation from the repeat storms that have struck the Golden State have hit the very region that drains to Lake Oroville, and the frequency of the storms has meant that the lake has not had a chance to recover, with water
levels dropping significantly in between storms.