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.
Triple digit heat has many people staying cool inside. But outdoor workers don't have that option.
Highway 140 will reopen Thursday afternoon after a mudslide made the road impassable in Yosemite National Park.
The "well above-average" rain of the past three months in California has not brought any improvement to drought conditions in the state.
The National Weather Service in Reno is warning of flash flooding in the Reno and Truckee areas until 5:15 p.m. The weather service is reporting severe thunderstorms and hail.
The National Weather Service is forecasting thunderstorms for the Sierra starting Tuesday through Thursday.