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5 Dead as ‘Atmospheric River’ Pounds Western U.S. With Rain and Snow

LOS ANGELES — As much of the Eastern United States begins to assess the damage wrought by a punishing winter storm, parts of the West are experiencing another severe weather event: an “atmospheric river” that forecasters say is likely to bring days of heavy rain and snow.

The “deep and fast-moving” storm system — a channel of wind in the atmosphere that transports water vapor from the tropics — had already begun pummeling parts of northwest California and Oregon on Tuesday, and it killed five people in three car crashes all involving felled trees, Oregon authorities said. The system was expected to continue through the week, delivering excessive rainfall that could cause flash flooding, mudslides and debris flows, forecasters said.

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At times, the rate of rainfall could be up to an inch per hour, said William Churchill, a forecaster and meteorologist with the National Weather Service’s Weather Prediction Center in College Park, Md.

Though the West often experiences atmospheric storms, what made this one unusual, he added, was the expected strength and duration. “California in general can largely use this precipitation,” Mr. Churchill said. “Unfortunately, when too much occurs all at once, it does cause problems.”

The greatest risk, he added, was in previously burned areas along the coast, where rapid, prolonged rainfall could cause mudslides or debris flows.

As of Tuesday evening, about two to six inches of rain had fallen in the hardest hit areas, and the storm system was expected to sweep through the region between the Rocky Mountains and the Sierra Nevada, as well as the Central Plains. The system was forecast to deliver rain across the West Coast as well as parts of Central and Southern California through early Wednesday, forecasters said, adding that a few scattered flash floods were possible.

Close to five million people in the Seattle and Portland, Ore., metro areas were under high wind warnings on Tuesday, with sustained wind speeds reaching up to 30 miles per hour and gusts of up to 60 miles per hour, Mr. Churchill said. The Seattle-Tacoma International Airport had recorded gusts of more than 50 miles per hour on Tuesday, he added. “That’s the more damaging component,” Mr. Churchill said of the wind gusts.

Also Read – Power restoration in Washington state delayed as utility company discovers ‘new issue’ as it attempts to repair vandalized substations

In Portland, the heavy downpour flooded roads and rivers, while high winds felled trees and power lines, knocking out power. As of Tuesday evening, more than 135,000 customers were without power across Oregon, according to PowerOutage.us, which tracks power interruptions. More than 60,000 customers had also lost power in California and Washington State, according to the site.

The Oregon State Police said the severe weather had caused two fatal accidents on Highway 26 alone. Around 11:30 a.m. on Tuesday, a “large diameter tree” fell onto the roof of a car that was driving eastbound on Highway 26, killing Justin Nolasco Pedraza, the 19-year-old driver, and two passengers, Bonifacio Olvera Nolasco, 41, and a 4-year-old child. All three individuals were “discovered deceased” by first responders, the police said.

Several hours later, a tree toppled and landed on the cab of a truck and killed James Darron Lyda, the 53-year-old driver. He was pronounced dead at the scene by emergency personnel, the police said.

In a third accident, which occurred at about 2 p.m. on Interstate 84, a tree fell onto the passenger side of a U-Haul dolly trailer. The impact killed Paula Chamu Sanchez, the 20-year-old passenger, the police said.

The Bay Area was also pummeled early Tuesday by the storm, with rain flooding roadways across the region. In San Ramon, Calif., about 35 miles east of San Francisco, the wild weather caused the collapse of a roof at a Big 5 Sporting Goods store, local authorities said, adding that the surrounding stores had closed for roof inspections.

In other parts of the Bay Area, roads were closed after high winds knocked down trees and power lines, local authorities said. A lane on part of U.S. 101, a major interstate highway, was also closed because of flooding, causing delays.

After a brief lull on Wednesday, the storm is expected to regain momentum, pounding a stretch from Central California to the Pacific Northwest with heavy rain and snow at higher elevations. Some regions already soaked on Tuesday could receive up to seven more inches of rain, according to Mr. Churchill, the Weather Service forecaster.

The area likely to be hardest hit, he added, was the port city of Eureka, Calif., and the surrounding region. Portland and Seattle are also expected to receive around two to three inches of additional rainfall, Mr. Churchill said, adding that parts of Southern California would see rain on Saturday and Sunday.

The “unsettled” weather is expected to linger through the weekend, according to the National Weather Service, bringing showers and thunderstorms to parts of eastern Texas and the lower Mississippi Valley.

Also Read – Fierce winter storm still taking a toll: 28 dead; thousands without power; flight cancellations mount. Live updates.

The majority of the Central and Eastern United States however, will finally experience a reprieve from the bitterly cold holiday weekend temperatures, according to the Weather Service.

“After a bone chilling Christmas weekend,” the service said, “the final days of 2022 are forecast to be much more comfortable.”

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