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
Researchers say California has been overdrawing its water account for a century.
Researchers at UC Davis fear that California’s drought may soon claim its first victim, the Red Hills Roach. The tiny fish is losing its water. Scientists fear it may soon be pushed to extinction.
A UC Davis report shows the drought has brought positive and negative effects to Lake Tahoe.
California's farm production costs totaled $36.6 billion in 2013, an 8.6 percent jump from the previous year. Higher rates for feed, labor, improvements and water contributed to the jump.
Californians will be voting on a new water bond this fall. On Wednesday night, Gov. Jerry Brown and state lawmakers replaced the $11 billion bond on the November ballot with a smaller one they believe has a better chance of passing at the polls.