After Christmas day rain, more rain is expected to arrive Sunday and last into Monday, the weather service said.
NBC Bay Area meteorologist Rob Mayeda said increasing rain chances will return by late afternoon and evening as a storm drops down the California coast.
Highest rain totals will likely be near the Santa Cruz mountains southward as the focus of the storm stays mainly to the south into Southern California into Monday.
Highs will be in the low to mid 50s with increasingly cooler air aloft into early Monday we may briefly see a slight chance for thunder near the coast, especially south of Santa Cruz, and snow levels will begin dropping closer to 4,000' by early Monday.
However most of the moisture will be moving out by this time so we'll have to see if Mt. Hamilton and higher peaks manage a dusting of snow before skies begin clearing on Monday.