A powerful storm walloped California and other parts of the western United States on Sunday, flooding rivers and shutting roads from mudslides in a state that has struggled with drought for years.
From 3 to 8 inches of rain is forecast for central and northern California and the Sierra Nevada mountains through early on Tuesday, and several feet of snow is likely for higher elevations, said meteorologist Andrew Orrison at the National Weather Service's Weather Prediction Center in Maryland.
"We're going to see heavy rain going into the evening and early morning," he said.
Locally heavy snow is expected in Nevada, and the northern Rocky Mountains could get several feet of snow as the system moves east over the next day or two, Orrison said.
The National Weather Service reported that almost 40 rivers or creeks in Northern California or western Nevada were flooded or threatened to top their banks.
The upper Napa River north of San Francisco was expected to cause "extreme damage to all towns along the reach," the California emergency agency said in a statement.