Ferocious winds knocked down trees, ripped through freeway and street signs, delayed hundreds of flights and knocked out power for thousands of people in California and Nevada.
Nearly 10 inches of rain is expected to hit parts of the drought-stricken regions of California. Although it will not make a significant help to the state's historic dry spell, it will be the first time San Francisco is seeing rain in six weeks.
The heaviest part of the rain is expected occur Sunday. The National Weather Service issued a heavy-rain, high wind-gust and flash-food warning for the region through Monday.
Urban areas could see up to four inches of moisture, while some counties could see 10 inches through Sunday.
It would take 150 percent of the average rainfall for California to recover from the dry period, state water officials say. The state would like to see more snow than rain because snowpack supplies about a third of the water needed by residents, agriculture and industry.
About 26 miles west of Seattle, an overflowing river inundated at least a half dozen homes on the Olympic Peninsula. Rescuers went door to door in Brinnon to check homes on a road partially blocked by a mudslide, Jefferson County Emergency Management spokeswoman Keppie Keplinger said.
Three people were rescued from a flooded pickup truck Friday morning, but none was injured, she said.
The threat of landslides will persist into the weekend, and weather officials warn of flooding in several rivers in western Washington. Oregon also saw flooding on roadways.
At least of a dozen people were hurt in car crashes on Nevada highways. Nine people were hospitalized in a crash on U.S. Highway 95A. Eight cars were involved and no deaths were reported.
NV Energy reported more than 3,000 customers in Carson City and nearly 2,000 in Reno-Sparks were without power at noon Friday as the winter storm blew into the area after a record high of 70 degrees in Reno the day before.
In the San Francisco Bay Area, power lines were snapped by falling trees and the wind ripped through freeway and street signs. More than 60,000 people lost power. By Friday evening, 9,000 customers remained without power, Pacific Gas & Electric said.
North of San Francisco, businesses in Marin, Napa, Solano, and Sonoma counties stacked sandbags to prepare for possible flash flooding from swollen waterways as rain started falling in the North Bay.
Winds of up to 15 mph were recorded east of the city Friday morning, and the blustery weather knocked down trees and caused power outages, the National Weather Service said.
San Francisco International Airport saw delays of up to 90 minutes and about 175 flights canceled Friday.
The Associated Press contributed to this report