From an NWS bulletin:
Wintry Storm Late Tonight through Early Wednesday
Hazardous travel across the mountains with chain controls and travel delays.
Locally heavy rain and accumulating hail possible in thunderstorms.
Travel delays likely during the morning commute.
Timing and Strength
Late tonight through Tuesday. Residual showers possible through Wednesday. (See this video for latest forecast timing).
0.50-1.25" across the Valley. Higher totals possible in thunderstorms.
Thunderstorms possible Tuesday afternoon.
Snow accumulations of 7-15" above 3500' Tuesday. Locally up to 2 feet over the highest peaks.
Light snow accumulations possible down to 3000'.
Highest snowfall rates will be mid-to-late Tuesday morning, then again late Tuesday afternoon through early evening.
A wintry storm system will be moving through Northern California late tonight into Tuesday. This system will be much wetter, snowier, and bring a greater chance of thunderstorms than Sunday's system. Check out this Youtube video for the latest forecast timing.