The National Weather Service says Tuesday through Thursday, about a half-an-inch of rain is expected in the valley with an inch or so of rain in the foothills.
Mike Smith with the Weather Service in Sacramento says there's also a chance of thunderstorms and even a tornado.
"This is probably a pretty normal winter storm for a normal season, so it's not going to help a whole lot; it's just one system," says Smith. "The good news is, we do have more on the way. We're expecting more rain coming up this weekend and then possibly some more even going into next week."
He says the region is still a long way from normal when it comes to precipitation - but there's positive news in the forecast.
Smith says the storm is also likely to bring a foot or two of snow to the Sierra. He says gusty winds are possible, and there's a winter storm warning in effect from 3 p.m. today through Thursday morning.
It is now the wettest season on record in Northern California, where most of the state gets its water supply.
UPDATE 10:48 p.m. Feb. 11: The evacuation and shelter-in-place notice has been lifted for Wilton residents.
(AP) - California's winter keeps getting wetter as the first in the latest round of storms moves ashore, bringing heavy rain and powerful winds.
(AP) - The National Weather Service in Reno says winds in excess of 100 mph over Sierra ridgetops could churn up waves as high as 5 feet on Lake Tahoe this weekend as a series of winter storms dumps several more feet of snow in the mountains.
Residents in Truckee and Washoe County are weathering the latest storm Tuesday while still reeling from the effects of the previous storm that hit over the weekend.