River flooding in parts of Western Washington is expected to be “catastrophic,” especially in the coastal lowlands near the Snohomish, Stillaguamish and Skagit rivers, according to a new assessment by the National Weather Service.

Areas facing “considerable” flooding stretch from Bellingham through south of Olympia.

“Catastrophic” flooding is expected from Mount Vernon through Everett and into areas east of Redmond.

Catastrophic flooding could bring significant risk to life and property, with a high risk of levees being topped and landslides expected in steep terrain, according to the National Weather Service. It could also mean record floods that destroy roads and structures and require evacuations or rescues of people and property, National Weather Service meteorologist Steve Reedy sa

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