The Pacific Northwest was seeing steady heavy rainfall Tuesday as an unusually strong storm system called an atmospheric river passes through the region, according to the National Weather Service.

Fire crews rescued two people who were trapped by floodwaters at a campsite in the Gold Bar area of Snohomish County north of Seattle on Monday night, KOMO-TV reported. Crews used drones and water rescue crafts to reach them and get them to safety, officials said.

Gold Bar police said in a social media post Monday evening that deputies were going door-to-door in the Moonlight Drive neighborhood to warn residents of imminent flooding.

A mudslide closed eastbound Interstate 90 overnight at North Bend, about 30 miles east of Seattle, according to the Washington State Department of Transportation.

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