The Latest: Winter storm bring flood fears to California

The Latest on storms across the West (all times local):

7:15 a.m.

A winter storm dumping rain and snow from California to Montana is drenching an already soaked Northern California, where authorities are advising residents that several rivers and creeks could overflow.

North of San Francisco, Sonoma County officials say they will activate an emergency center at 8 a.m. Tuesday because of threats of flash floods and mudslides.

Sonoma County Board of Supervisors chairman David Rabbit says in a statement it is "time to locate emergency kits."

The National Weather Service says some rivers and streams could hit flood stage by late Tuesday. It issued several flood watches for Sonoma, Napa and Marin counties.

Sonoma County officials issued a flood warning, saying the Russian River near the community of Guerneville is expected to hit flood stage early Wednesday.

In neighboring Napa County, the Napa River in San Helena could also overflow.

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12 a.m.

A fierce winter storm slamming the western U.S. is expected to bring blasting winds, rain and feet of snow to California through Wednesday.

The storm already has toppled trees, closed roads and triggered power outages from Oregon to Montana.

In the Sierra Nevada along the California-Nevada line, the National Weather Service has issued a storm warning, with up to 8 feet (2.44 meters) of snow at higher elevations and winds gusting to 140 mph (225 kph) over ridgetops.

In the Lake Tahoe area, several mountain highways have been closed because of spinouts or avalanche concerns.

Flood and flash flood watches are in effect for the Sacramento area and the San Francisco Bay Area and forecasters warn that the Napa and Russian rivers are likely to overflow their banks by Wednesday.