SAN FRANCISCO – An atmospheric river has begun to slam California that is expected to bring days of heavy rain, strong wind gusts and potentially feet of mountain snow to the Golden State through early next week, ushering in the region's rainy season.

The storm system is forecast to bring several months' worth of rain to Southern California in the span of just a few days, while a flash flood threat covers the Bay Area and Northern California Thursday.

WHAT IS AN ATMOSPHERIC RIVER?

Santa Clara County urged drivers to use caution Thursday morning. Meanwhile, while heavy rain fell during the height of the Thursday morning rush in San Francisco .

A brief ground stop was issued at San Francisco International Airport due to high winds Thursday afternoon.

Meanwhile, the City of Los Angeles i

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