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
The Central Sierra Nevada snowpack this year is larger than the previous four years combined, according to new data from NASA.
It is now the wettest season on record in Northern California, where most of the state gets its water supply.
Some farmers in the San Joaquin Valley will finally get a full supply of water.
California Governor Jerry Brown ended the drought state of emergency in most of California Friday. Water reporting requirements and prohibitions on wasteful practices are still in place.
California is experiencing one of its wettest winters in years. But farmers on the west side of the San Joaquin Valley still won’t receive a full supply of water from the federal Central Valley Project.