SAN FRANCISCO (AP) — Another major storm moving into Northern California was expected to bring more pouring rain, flooding and additional problems to an area already soaked after two major storms, forecasters said Saturday.

Residents of Northern California enjoyed just a bit of a respite, but the next storm — the third in a string of powerful weather systems to hit the region since Wednesday — is expected arrive Saturday night and force several rivers over their banks, National Weather Service forecasters said.

With rivers and streams already running high and the ground saturated from the previous storms, the National Weather Service issued flood warnings for both the Napa and Russian rivers, two rivers north of San Francisco with a history of flooding, National Weather Service hydrologist Mark Strudley said.

"Some roads will become inundated and some of the agricultural areas will take on some water," Strudley said.

The Napa River was expected to flood near St. Helena and Napa around noon on Sunday, while the Russian River was expected to flood near Guerneville early Monday morning, Strudley said.

The Napa River overwhelmed downtown Napa in 2005, flooding or destroying about 1,000 homes and forcing thousands of residents to leave the area.

With that in mind, residents worked to fill 700 bags with 10 tons of sand Saturday morning, city official Danny Lerma said.

"When you see it happen, you always remember, and you say, 'I'm going to be better prepared,'" Lerma told KGO-TV. "And that's what they're doing right now."

Forecasters said the Truckee River near Lake Tahoe is expected to crest above flood level by Sunday morning. The threat of flooding prompted officials in Truckee, a small town of about 16,000, to set up an evacuation center Saturday night.

A flash flood watch was also in effect for a wide area of Northern California through Sunday evening.

Just across the border in Nevada, a state of emergency was declared in Reno, Sparks and Washoe County due to the expected flooding.

Reno city spokeswoman Michele Anderson said public servants would be working overtime through the weekend to control what's expected to be the worst flooding there since 2005. Continued...