It originates from flood recurrence intervals set in the 1960s when the floodplain maps used today by insurance companies and the Federal Emergency Management Agency were made, said Western Washington University geology professor Allison Pfeiffer.

Heavy rain continued to fall over parts of the state Thursday morning, prompting road closures, water rescues and suspension of Amtrak trains between Seattle and Vancouver.

Days of torrential rain in western Washington caused historic floods that stranded families on rooftops, washed over bridges, and damaged homes.

Several small Whatcom County cities near the Canadian border were evacuated as the Nooksack River, fueled by persistent rain, flooded.

Emergency crews are racing to reach survivors and recover more bodies Tuesday in Indonesia, Sri Lanka and Thailand

The Mud Mountain Dam, located east of Tacoma just outside Pierce County, is one of five dams managed by the U.S. Army Corps of Engineers to battle historic flooding in western Washington that was easing in local areas Friday.

All residents living within the 100-year floodplain of the Skagit Valley were ordered to leave, as the Snohomish and Skagit rivers reached historic levels. Dozens of people have been rescued from rising floodwaters, and the National Weather Service expects risk to life and property to be “catastrophic.”

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