1 death from falling tree as storm hits Washington, knocking out power for 650,000

At least one person was killed and two people were injured by falling trees in Washington Tuesday night as an atmospheric river carried strong winds into the Pacific Northwest, knocking out power to many.

A woman in her 50s was killed in Lynwood after a tree fell on a homeless encampment, South County Fire said on Facebook. In Puget Sound, two were transported to hospitals when a tree fell on a trailer.

“One patient was released in a short time. It took firefighters an hour to free the other patient,” Puget Sound Fire said.

About 650,000 customers in Washington were without power just after midnight, according to Poweroutage.usa website that tracks energy providers. The majority of the outages were in Snohomish County and King County, which includes Seattle.

A massive plume of moisture from the Pacific called an atmospheric river hit the West Coast Tuesday afternoon and is expected to last until Friday. The storm is expected to become a bomb cyclone – meaning the pressure at the center of the storm will drop 24 millibars within 24 hours.

The storm can be so strong that it even drops close to double – meaning more than 40 millibars in 24 hours.

ABC News’ Max Golembo and Emily Shapiro contributed to this report.