Northern California is in for a weather shift as a fast-moving system sweeps through the region late Sunday into Monday. Expect light rain and mountain snow, with gusty winds in the Sierra and breezy southerly winds in the Valley. Overnight temperatures will drop, with Tuesday morning likely being the coldest of the week. Widespread frost is possible, particularly in sheltered Valley areas.
Midweek brings another round of wet weather, primarily north of I-80, with more widespread rain expected by next weekend. Mountain snow could lead to winter driving delays, especially above 6,500 feet, where up to 4 inches of snow is forecast. Protect sensitive plants and outdoor pets as frosty mornings set in.