‘Atmospheric river’ bringing rain, wind, snow to PNW

Ap Week In Pictures: Asia
Aaron Favila - staff, AP

People walk under the rain caused by Tropical Storm Nalgae as they wait for a ride in Manila, Philippines on Saturday Oct. 29, 2022. Flash floods and landslides set off by torrential rains left multiple people dead, including in a hard-hit southern Philippine province, where dozens of villagers are feared missing and buried in a huge mudslide laden with rocks, trees and debris, officials said Saturday.

SEATTLE (AP) — An atmospheric river is bringing strong to damaging winds, heavy rain and below-normal temperatures for the Puget Sound region from Thursday evening through Saturday morning, the National Weather Service said.

Snow in the passes is expected as is potential river flooding, The Seattle Times reported.

Jeff Michalski, a meteorologist with the National Weather Service in Seattle, said to expect heavy rainfall across the region, including western Oregon, through Saturday evening, with the heaviest amounts over the Olympic and Cascade mountains.

Tree damage and some power outages are possible, according to the weather service. A portion of west central Washington, including the Seattle area, is under a flood watch through Saturday afternoon.

Portland’s National Weather Service office warns that high seas and strong winds will make boating conditions hazardous starting Thursday night.

“Attention boaters and mariners: we’re expecting high seas and strong winds the next few days, starting tonight, for the coastal waters of SW WA & NW OR,” the weather service said in a tweet. “It’s a good time to stay on land.”

Atmospheric river storms are fueled by long and wide plumes of moisture pulled in from the Pacific.

A cooler air mass with temperatures in the 30s and 40s Fahrenheit is expected starting Sunday and continuing next week with lows in the 20s and a small chance of low elevation snow, the weather agency said.

“Certainly the air mass is cool enough to support any snowfall,” Michalski said.