Residents in western Washington are evacuating as heavy rain raises rivers to dangerous levels, prompting Washington Gov. Bob Ferguson to declare a statewide emergency affecting up to 100,000 people. Major flooding is expected, particularly along the Skagit and Snohomish rivers, with significant risks of landslides. Communities are preparing with sandbags as officials warn of historic river crests and potential levee failures. In Mount Vernon, which has a history of flooding, businesses and homes are at risk, leading to heightened concern among residents.