west-coast-battered-by-severe-storms-as-parts-of-us.-see-springlike-temperatures

Two people died in a submerged car in California, parts of the Pacific Northwest faced the rare prospect of snow on Christmas Day, and fierce winds were forecast in New Mexico as winter storms swept across the western United States.

In parts of Seattle and Portland, residents were bracing for an uncommon white Christmas, according to the National Weather Service. High winds could knock out power lines in New Mexico. Rain in the Phoenix area could make roads slick and treacherous for drivers.

But it’s a different story for parts of the central and southern U.S., where forecasters say residents will “have to settle for spring-like temperatures” thanks to an unseasonal holiday heatwave.

The extreme weather hitting the West Coast is being driven by an atmospheric river, a sky-born plume of moisture from the Pacific Ocean.

Residents from western Washington to southern California are facing flash-flood warnings, with snow and rainfall expected from Christmas Eve through Christmas night.

On Thursday, flooding in California proved deadly after two people died when their vehicle was submerged in a flooded underpass in Millbrae, south of San Francisco. Firefighters were able to rescue two people who climbed on top of a car, but were not able to reach the fully submerged vehicle, said Det. Javier Acosta of the San Mateo County Sheriff’s Office.

To the south, the Rocky Butte area of San Luis Obispo County registered 7 inches of rain Thursday through Friday, according to the weather service. Mt. Baldy in Los Angeles County recorded 5 inches.

Evacuation orders were issued Thursday in Orange County, California, due to possible mudslides and debris flows in three canyons where a wildfire had blazed last December, according to county officials. The orders came as the Orange County Fire Authority reported a mudslide Thursday evening. No injuries were reported in the incident, and evacuation orders were lifted Friday afternoon.

Flooding on Friday was reported from Palm Springs to downtown San Diego.

A second wave of rain and snow was expected in Southern California on Saturday and Sunday. Federal forecasters said snow could appear at 2,500 feet, possibly impacting some of the Los Angeles basin’s foothills and raising the prospect of a rare white Christmas in the land of sandals and shorts.

In the Sierra Nevada mountains area, around 150 households were given an evacuation warning after cracks were found in granite at the Twain Harte Lake Dam. Sgt. Nicco Sandelin of the Tuolumne County sheriff’s office said there did not appear to be any immediate danger, however.

The evacuation warning came as the Sierras expected to see as much as 5 to 8 feet of snow over the holidays, with the possibility of snow piling up to 10 feet high at higher elevations, according to the National Weather Service. It warned against traveling through the mountains, with the snowfall expected to create hazardous driving conditions.

Workers clear a mudslide from a double lot in Oakland, Calif.,. More rain is expected through the holiday weekend according to the National Weather Service.Jane Tyska / MediaNews Group via Getty Images

“Travel will be be hazardous, even impassable at times, in the hardest hit locations with towering snow drifts and whiteout conditions,” the weather service said in a statement.

Eastbound Interstate 80 through Donner Summit was shut down for hours Friday as snowy conditions helped led to spinouts, the California Department of Transportation said. The entire highway was closed briefly before it was reopened at nightfall. Chains were required for the route.

In preparation for freezing temperatures, snow and ice in the Pacific Northwest this weekend and next week, state officials in Oregon have declared an emergency and shelters are being opened throughout the region to help homeless residents.

Federal forecasters said Friday that Seattle could see 6 inches of snow between Saturday and Monday. That would put the region near record levels of snow for Dec. 25-27.

But while parts of the western U.S. face winter weather woes, residents in parts of the central and southern U.S. are expected to see record-breaking warm temperatures.

“In Christmas-speak, it means Snow Miser has control of the West while Heat Miser has full control of the weather in Southtown with no compromise of snow in Southtown this Christmas,” the National Weather Service said in a festive forecast.

The weather service office that serves Kansas City declared the Missouri city was at 67 degrees “and rising,” breaking the 66 degree record set in 1955.

Dallas-Fort Worth fell short of topping the 1955 record of 88 degrees, but the temperature still rose to 82 on Christmas Eve.

“In contrast to the West, those dreaming of a White Christmas throughout much of the South and East Central U.S. have to settle for spring-like temperatures this Christmas,” the National Weather Service said.

A tree blocks lanes of Highway 13 near Redwood Road in Oakland, Calif. Aric Crabb / MediaNews Group via Getty Images

Christmas Eve night temperature anomalies are expected to bring potentially “record-breaking warm daily minimum temps” from the Ohio Valley to the Southern Plains. Or in other words, “temperatures so mild, that Santa may want to pack a lighter red coat when going house to house,” the National Weather Service quipped.

By Christmas Day, the “spring-like air mass” delivering warmer temperatures is expected to reach the Mid-South and Mid-Atlantic with highs in the 60s and 70s, bringing more record warmth, “most notably from the Tennessee and Ohio Valleys to ‘Deep in the Heart of Texas’,” the weather service said.

Chantal Da Silva

Chantal Da Silva is a breaking news editor for NBC News Digital based in London. 

Dennis Romero writes for NBC News and is based in Los Angeles.

Daniel Arkin

,

The Associated Press

and

Todd Miyazawa

contributed

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