The Pacific Northwest region, encompassing areas of the United States and Canada, is experiencing widespread flooding as a result of an atmospheric river event. Heavy rainfall has led to elevated river levels, road closures, and numerous evacuation orders and advisories for residents in affected areas across both nations.
Overview of the Event
An atmospheric river has delivered significant rainfall to the Pacific Northwest, impacting areas with already elevated river levels. The U.S. National Weather Service has issued flood watches and warnings for portions of Western Washington state and Northwest Oregon, specifically noting potential impacts on the Skagit and Snohomish river basins. Further rainfall was projected for Thursday, November 30.
United States Impact
Washington State Emergency Declaration
On Wednesday, November 29, Washington State Governor Bob Ferguson declared a statewide emergency. The declaration indicated that approximately 100,000 residents statewide could potentially receive evacuation orders. It also highlighted that continued precipitation, including rain and mountain snow, was expected to exacerbate flood conditions and could disrupt supply chains and transportation infrastructure.
Skagit County Evacuations
In Skagit County, a significant agricultural region located north of Seattle, an immediate evacuation order has been issued for residents within the floodplain. Authorities estimated that approximately 75,000 to 78,000 individuals residing in the Skagit River floodplain might be evacuated.
Snohomish County Flooding and Rescues
Snohomish County authorities reported multiple helicopter rescues of individuals trapped in their homes in Sultan, Washington, approximately 65 kilometers (40 miles) northeast of Seattle. The Skykomish River in the eastern part of the county crested above 7 meters (24 feet) overnight, nearing a record level. The Snohomish River is also experiencing significant flooding, with water levels approaching local flood defenses. Officials identified the eastern part of the county as the most affected area.
Pierce County Rescues and Road Closures
In Pierce County, located about 68 kilometers (42 miles) south of Seattle, a swiftwater rescue team evacuated three individuals from an RV park in Orting. Multiple roads in Pierce County are also reported as closed due to flooding.
Regional Infrastructure Concerns
Widespread road closures have been confirmed across King, Snohomish, and Pierce counties due to floodwaters. Officials anticipated additional closures throughout Thursday. The emergency declaration noted potential severe impacts on supply chains and transportation infrastructure.
Canadian Impact
In Canada, major highways leading to Vancouver have been closed. These closures are a result of flooding, accumulation of debris, and an increased risk of avalanches in the affected regions.
Ongoing Outlook
Thousands of individuals across both the United States and Canada remain subject to existing evacuation orders and advisories. The forecast indicated continued rainfall, suggesting an ongoing risk of flooding and related disruptions in the affected regions.