Western storms bring flood threats, snow for Christmas

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Caltrans workers clear the remains of a 100-foot eucalyptus tree from the northbound lanes of Highway 13 in Oakland, Calif., on Thursday, Dec. 23, 2021. Heavy overnight rains in Northern California left two people dead in a submerged car as authorities on Thursday urged residents of several Southern California mountain and canyon communities to voluntarily leave their homes because of possible mud and debris flows. (Jane Tyska/Bay Area News Group via AP)
Storm clouds are seen over San Francisco in this view from Oakland, Calif., on Thursday, Dec. 23, 2021. Heavy overnight rains in Northern California left two people dead in a submerged car as authorities on Thursday urged residents of several Southern California mountain and canyon communities to voluntarily leave their homes because of possible mud and debris flows. (Jane Tyska/Bay Area News Group via AP)
Workers clear a mudslide from a double lot on Westover Drive in Oakland, Calif., on Thursday, Dec. 23, 2021. Heavy overnight rains in Northern California left two people dead in a submerged car as authorities on Thursday urged residents of several Southern California mountain and canyon communities to voluntarily leave their homes because of possible mud and debris flows. (Jane Tyska/Bay Area News Group via AP)
A large eucalyptus tree blocks the northbound lanes of Highway 13 just past Redwood Road in Oakland, Calif., Thursday as heavy rain falls across the region. Heavy overnight rains in Northern California left two people dead in a submerged car as authorities on Thursday urged residents of several Southern California mountain and canyon communities to voluntarily leave their homes because of possible mud and debris flows. (Jessica Christian/San Francisco Chronicle via AP)
In this image taken from video from a Caltrans remote video traffic camera, traffic is stopped along a snow covered Interstate 80 at Donner Summit, Calif., on Thursday. (Caltrans/via AP)
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LOS ANGELES — Two people died in a submerged car, evacuations were ordered for wildfire-scarred California, and Seattle and Portland faced the rare chance of snowy streets as a wave of storms rolled through the West.

The new storms, which could drop rain and snow over much of the region into next week and plunge the Pacific Northwest into a lengthy cold snap, follow a now-departed atmospheric river that delivered copious amounts of precipitation this week.

On Thursday, two people died when their car was submerged in a flooded underpass in Millbrae, California, just south of San Francisco. Firefighters rescued two people who had climbed atop a car but they couldn’t reach the fully submerged vehicle, San Mateo County sheriff’s Det. Javier Acosta said.

In the Sierra Nevada, an evacuation warning was issued Thursday for about 150 homes downstream of Twain Harte Lake Dam after cracks were found in granite that adjoins the manmade part of the 36-foot-high structure.

The warning was lifted around 6 p.m. after inspectors determined the dam was structurally sound and clear it for continued use, according to a Facebook post by the Tuolumne County Sheriff’s Office.

The Sierra range could see 5 to 8 feet of snow through the holidays, with 10 feet possible at higher elevations, and authorities urged people to avoid traveling through the mountain passes, which could be treacherous.

A winter storm warning issued Friday remains in effect until 10 a.m. Tuesday for most of the Sierra, where as much as 3 feet of snow had fallen early Friday at Mammoth Mountain south of Yosemite National Park. About 2 feet fell Thursday at some Tahoe-area ski resorts.

As much as 5 feet of new snow is possible by Tuesday on mountain tops around Lake Tahoe. One to 3 feet to is expected at lake level. Wind gusts over ridges could exceed 100 mph, the National Weather Service said, making travel difficult to impossible.

In Southern California,