Sunday starts with lingering showers and patchy dense fog. Rain showers in the valley and foothills will likely wrap up shortly after daybreak with some areas of fog lingering through midday. Snow levels are around 7,900', meaning only the higher peaks are seeing snow Sunday morning and most of Hwy 50 and I-80 are experiencing rain showers that will dissipate in the late morning. The afternoon will be mainly dry across much of Northern California with a few peaks of sunshine and above normal temperatures topping out in the low 60s in the valley. This afternoon will have good weather for travel and running errands. The next wave of showers arrives overnight with snow levels between 7,500 and 8,000 feet. Accumulations are forecast to be minor. Most of Monday will remain dry, other than some patchy fog in the morning. The next wave of potentially heavy rain arrives in the early morning hours of Tuesday and persists through much of the day. Snow levels will fall to 6,500 feet by Tuesday afternoon. Tuesday is an Impact Day across Northern California and travel is discouraged. Christmas Day on Wednesday is expected to be dry and cool with partly to mostly cloudy skies. More wet weather returns on Thursday and will continue on and off through Saturday.