The National Weather Service says a significant storm will bring between a quarter and a half-an-inch of rain to the valley and up to 2.5 inches of rain to the Sierra.
David Rowe with the weather service says there will be snow too.
"Probably about a foot to a foot and a half at the ski areas and maybe 2 to 3 inches down to about 4,500 feet," says Rowe.
Rowe says there are also flooding concerns in areas scarred by wildfire last summer -- for example the Rim Fire near Yosemite.
"When you get heavy rainfall intensity in a short amount of time, you tend to get mud and dust and debris left over from the fires last summer that'll accumulate and run downhill," he says.
Rowe says this will be a significant storm, but the region needs a series of these storms to start recovering from the drought. He says the forecast is dry again for the weekend and early next week.
Rowe urges valley commuters to use caution, especially Thursday morning, when the roads are likely to be slick, and says chains will likely be required in the Sierra.
The weather is about to change. Attached is the NOAA prediction for snow onI-80. Be prepared for winter driving. pic.twitter.com/kEvvfGXHAo— Caltrans District 3 (@D3PIO) January 28, 2014
Record dry January expected in many Northern and Central California cities as drought drops reservoir levels.
The California Department of Water Resources says the state’s snowpack is “dismally meager.” A lack of snow in the Sierra is keeping rivers low and drying up some reservoirs.
The City of Roseville is yanking grass and replacing it with drought-resistant landscaping to conserve water. Roseville also offers homeowners a 'Cash For Grass' rebate program.
The City of Sacramento says water customers in 2014 "cut water use to the lowest level per person per day in 100 years."
Salmon rely on cool water temperatures and aquatic plants to survive. So California’s drought has hit them particularly hard. But UC Davis researchers have found one area where the fish are flourishing.