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.
![In 2021, California saw everything from intense drought to torrential rain. Researchers and water agencies say that the future of the state’s drought depends on adapting to these shifts. Andrew Nixon / CapRadio; Associated Press, file](/cdn-cgi/image/format=auto,width=186,height=140,fit=crop/media/12262257/012622climatewhiplash-p.png)
January 28, 2022Last year, California saw everything from intense drought to torrential rain. Researchers and water agencies say that the future of the state’s drought depends on adapting to these shifts.
![Snow geese fly over the Sacramento River National Wildlife Refuge complex in Willows on Oct. 6, 2021. Photo by Nina Riggio for CalMatters](/cdn-cgi/image/format=auto,width=186,height=140,fit=crop/media/12261318/110221-birds-drought-nr-cm-517-p.jpg)
November 11, 2021As the drought dries up California’s wetlands, traveling birds such as ducks, geese and eagles are struggling to survive and breed. “This drought is bad. The odds are against us,” a state expert said.
![In this Sept. 23, 2013 file photo, water flows through fish diversion louvres at the John E. Skinner Delta Fish Protective Facility from the Clifton Court Forebay on its way to the Harvey O. Banks pumping plant, near Tracy, Calif. AP Photo/Rich Pedroncelli, file](/cdn-cgi/image/format=auto,width=186,height=140,fit=crop/media/12257099/021221_california-water-drought-p.jpg)
June 23, 2021Drought resilience depends on location but also extraordinary engineering — determining which California places are running out of water this year and which remain in good shape.
![Boaters fish on the Sacramento River outside of Isleton. Water supplies from the San Joaquin-Sacramento Delta are insufficient, so the state has warned thousands of users to halt pumping. Photo by Anne Wernikoff, CalMatters](/cdn-cgi/image/format=auto,width=186,height=140,fit=crop/media/12259071/061521_sanjoaquinsacramentoriverdelta_aw_sized_01_061721-p.jpg)
June 17, 2021About 4,300 users were issued notices to halt diversions from the Sacramento-San Joaquin Delta.
![Kayakers make a long trek to the water's edge at a drought-stricken Lake Mendocino, currently at 29% of normal capacity, in Ukiah, Calif., Sunday, May 23, 2021. California Gov. Gavin Newsom declared a drought emergency for most of the state. Josh Edelson / AP Photo](/cdn-cgi/image/format=auto,width=186,height=140,fit=crop/media/12258863/060521_droughtkayakersweb-p.jpg)
June 5, 2021Experts say the current drought is hotter and drier than previous ones, meaning water is evaporating faster.
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