SAN FRANCISCO – Another major storm moving into northern California was expected to bring more pouring rain, flooding and problems to an area already soaked after two major storms, forecasters said Saturday.

Residents 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 — was expected to force several rivers over their banks after it arrived Saturday evening, National Weather Service forecasters said.

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

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