In December 2023, an atmospheric river caused flooding in the Pacific Northwest.

[4] The Oregon Coast saw highway and school closures, and Cape Lookout State Park closed as well.

[5][6][7] A mudslide south of Kelso caused Amtrak to suspend passenger rail service on the Cascades and Coast Starlight between Seattle and Portland, Oregon.

[8] The Stillaguamish River in Snohomish County reached 21.34 feet (6.50 m) at Arlington, setting a new record high.

[1] The river inundated the community of Silvana[1] and cut off portions of State Route 530.