Washington and Oregon are bracing for major flooding and possible evacuations as an atmospheric river event brings heavy rainfall to an already saturated region.

Western Washington is under a flood watch through Friday, and watches are in place for parts of Idaho and western Montana.

Washington’s State Emergency Operations Center was activated Tuesday at level 1, its highest response level, Gov. Bob Ferguson said in a statement.

Firefighters have already used inflatable kayaks to rescue people trapped in vehicles submerged in water.

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