Hurricane-force winds in the mountaintops and torrential rainfall in the valleys caused havoc in Northern California on Monday, flooding roadways and stranding drivers on major highways after mudslides.

The extreme weather pummeling the Sierra Nevada is the result of a meteorological phenomenon known as the “Pineapple Express,” which ushers an atmospheric river of moisture-rich warm air north from the tropical waters of Hawaii. The powerful storm has blasted Lake Tahoe and the Yosemite Valley with several feet of snow and drenching downpours, with more than 12 inches of precipitation in some locations — and more to come this week.

All of the ski resorts surrounding Lake Tahoe were shut down amid the winds and snow, and the San Francisco area received more rain during the first eight days of 2017 than it did during all of 2013.

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