A winter storm that brought powerful wind gusts to Oregon on Tuesday caused at least two fatal car accidents that left four people dead, preliminary police investigations have found. 

Weather conditions also appeared to have contributed to a third fatal crash that killed one person and injured another, police said.

Three people were killed, including a 4-year-old girl, when severe weather caused a large tree to fall on their pickup as they were traveling U.S. 26 about 15 miles east of the coastline, Oregon State Police said in a news release. 

The passengers were dead when first responders arrived.

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kayaker in Seattle

A person kayaks on South Portland Street in Seattle's South Park neighborhood on Tuesday morning. (Erika Schultz/The Seattle Times via AP)

Further east on U.S. 26 on Mount Hood, a motorist was killed when a large tree fell on the cab of the commercial truck he was driving because of snow and strong winds, causing him to lose control and leave the highway, state police said. The 53-year-old driver, who was alone in the truck, was pronounced dead at the crash site.

Another person died when a tree fell and struck a pickup on Interstate 84 near Cascade Locks in the Columbia River Gorge, the agency said. The driver was injured and taken to a hospital. The weather appears to have contributed to the tree falling, said state police spokesperson Captain Kyle Kennedy.

Seattle Resident

Salvador Sanchez, a resident of Seattle's South Park neighborhood for 30 years, walks in floodwaters next to his home on Tuesday morning. (Erika Schultz/The Seattle Times via AP)

Strong winds knocked over trees and caused power outages across large swaths of the Pacific Northwest on Tuesday, cutting power for more than 160,000 customers at certain points. Wind gusts reached 86 mph near Cape Perpetua on Oregon’s central coast and 107 mph near Timberline Lodge on Mount Hood, said Andy Bryant, a hydrologist with the National Weather Service’s Portland office.

Utility companies have progressively restored power, but more than 10,000 people in Oregon were still affected by outages as of 5 p.m. Thursday, according to online tracker PowerOutage. 

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Earlier on Tuesday, PowerOutage.com reported a peak of about 117,000 affected customers earlier in the afternoon.

Portland General Electric and Pacific Power, among the utilities reporting the highest number of outages, both said they had hundreds of service crew members, including some from out of state, working to assess and repair damage.

Seattle Flooding

Manuel Israel Archila Lopez uses a bucket to scoop water from his family's home in Seattle's South Park neighborhood on Tuesday morning. (Erika Schultz/The Seattle Times via AP)

In Washington state, thousands of residents east of Seattle remained without power Wednesday afternoon after the previous day’s wind storm caused extensive damage to power lines in and around North Bend and Snoqualmie.

Gerald Tracy, a spokesperson with Puget Sound Energy, told KOMO-TV that power was expected to be restored to the area around 10 p.m. Wednesday, with the caveat that additional problems could push that timeline back.

"It is mountainous terrain, more rural areas, where sometimes our crews will have to hike out on foot and use hand tools to take care of the situation," Tracy said.

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The outages come on the heels of a strong wind, ice and rainstorm that is slamming parts of Oregon and Southwest Washington

Tuesday’s storm system also brought massive waves, high tides and flooding to the region.

Wave heights reached 30 feet along the Oregon coast, the National Weather Service said.

Hugo Archila,

Hugo Archila, wearing red, and Jesus Armando Arredondo use a bucket and broom to clear out water from Archila's home in Seattle's South Park neighborhood on Tuesday morning. (Erika Schultz/The Seattle Times via AP)

Storm surges flooded parts of Washington state, including Seattle, where some residents of the South Park neighborhood kayaked through the streets and used buckets to clear their homes of water.

A record high tide of 18.4 feet submerged parts of the state capital of Olympia and washed jellyfish over the shoreline onto the city’s streets, officials said.

A coastal flood advisory is in effect for the Seattle area through Friday afternoon.

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The Associated Press contributed to this report.