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 USDA is providing disaster assistance to beekeepers in California. The money may help some stay in business.
As the forecast for a wet December improves, a new study says only so much water can be stored by future dam or reservoir projects in California.
The National Weather Service is offering a more positive forecast for the likelihood of a wet December in California.
(AP) - Officials say residents of a California community where hundreds of home wells have run dry can now take hot showers in portable facilities set up in a church parking lot.
The U.S. Drought Monitor measures the impact of the drought across the nation and California cattle ranchers have millions of dollars at stake based on that information. But some are questioning the accuracy of the data.