Strong winds from an atmospheric river swept through the Pacific Northwest on Tuesday night, killing at least one person and injuring two others in Washington as falling trees caused widespread destruction and power outages.

In Lynwood, a woman in her 50s was killed when a tree fell on a homeless encampment, according to South County Fire. In Puget Sound, two people were hospitalized after a tree fell on a trailer. “One patient was extricated in a short period of time. It took firefighters an hour to extricate the second patient,” Puget Sound Fire reported.

The powerful storm left approximately 650,000 customers in Washington without electricity as of midnight, with Snohomish and King counties, including Seattle, experiencing the brunt of the outages, according to Poweroutage.us.

The atmospheric river, a massive plume of Pacific moisture, began hitting the West Coast on Tuesday afternoon and is expected to persist through Friday. Forecasters warn that the storm may intensify into a bomb cyclone, a phenomenon in which the storm’s central pressure drops 24 millibars or more within 24 hours, bringing severe weather to the region.