Summary (tl;dr)

Washington State is experiencing record-breaking flooding across its western regions, particularly in Skagit and Snohomish Counties, driven by a powerful atmospheric river. This severe weather event has prompted widespread evacuations, road closures, and a statewide emergency declaration as rivers reach or exceed historic levels.

Essential Background

Atmospheric rivers are narrow corridors in the atmosphere that transport vast amounts of moisture from tropical or sub-tropical sources, often likened to "rivers in the sky." When these systems make landfall, especially in mountainous regions like the Pacific Northwest, they can unleash torrential rainfall, leading to severe flooding, landslides, and significant infrastructure damage. The Pacific Northwest is historically vulnerable to such events, which account for approximately 80% of all flooding damage along the West Coast annually. Scientists note that climate change is generally linked to more frequent and intense extreme storms, droughts, floods, and wildfires.

The Full Story

Beginning around December 8-9, 2025, a potent atmospheric river brought sustained and heavy rainfall to Western Washington, causing rivers to swell rapidly towards unprecedented levels. Governor Bob Ferguson declared a statewide emergency on December 10, anticipating record-breaking flooding in the Puget Sound, North Cascades, and eastern low-lying river basins, and authorizing the deployment of hundreds of National Guard members for assistance.

Major flooding and evacuations are underway in several counties. In Skagit County, the Skagit River is forecasted to crest at record heights, prompting Level 3 "GO NOW" evacuation orders for residents in communities like Mount Vernon, Concrete, Hamilton, Rockport, and Marblemount, with an estimated 75,000 people in the 100-year floodplain urged to evacuate. Snohomish County has also declared a county-wide emergency, with the Stillaguamish, Snohomish, and Skykomish rivers reaching major or near-record flood stages. Evacuations have been ordered in areas such as Ebey Island and Sultan, while schools in Index have closed due to flooding, and livestock are being moved to shelters like the Evergreen State Fairgrounds in Monroe. In Pierce County, parts of Orting, including an RV park, have faced "GO NOW" evacuation orders due to concerns about the Puyallup River. Rescues of stranded individuals and vehicles have been reported across the affected regions, and significant road closures, including segments near Interstate 5, are impacting travel.

Why It Matters

This severe flooding event carries significant implications for residents, infrastructure, and the economy of Washington State. The widespread evacuations and property damage pose an immediate humanitarian crisis, disrupting thousands of lives and straining emergency services. Critical infrastructure, including roads, bridges, and even healthcare facilities, are threatened by floodwaters and potential landslides. The agricultural industry in fertile river valleys, such as the Skagit Valley, faces substantial losses. Beyond the immediate crisis, the repeated occurrence of intense atmospheric river events raises long-term concerns about the resilience of communities and infrastructure to extreme weather patterns, potentially exacerbated by climate change.

Geographic Location

• Skagit County, Washington, United States (record flooding and widespread evacuations)
• Mount Vernon, Skagit County, Washington, United States (Level 3 "GO NOW" evacuation orders, sandbagging operations, Skagit River crest)
• Concrete, Skagit County, Washington, United States (Level 3 "GO NOW" evacuation orders, record Skagit River crest)
• Hamilton, Skagit County, Washington, United States (Level 3 "GO NOW" evacuation orders)
• Rockport, Skagit County, Washington, United States (evacuation recommendations)
• Marblemount, Skagit County, Washington, United States (evacuation recommendations)
• Snohomish County, Washington, United States (county-wide emergency proclamation, major river flooding, evacuations)
• Arlington, Snohomish County, Washington, United States (Stillaguamish River expected to reach near-record heights)
• Snohomish, Snohomish County, Washington, United States (emergency proclamation, Snohomish River expected to crest at record levels)
• Monroe, Snohomish County, Washington, United States (road closures, emergency shelter at Evergreen State Fairgrounds)
• Gold Bar, Snohomish County, Washington, United States (Skykomish River at major flood stage, road closures)
• Sultan, Snohomish County, Washington, United States (evacuation warnings for low-lying areas)
• Index, Snohomish County, Washington, United States (school closures due to flooding)
• Ebey Island, Snohomish County, Washington, United States (evacuation orders due to dikes expected to overtop)
• Orting, Pierce County, Washington, United States (Level 3 "GO NOW" evacuation orders, Puyallup River concerns, RV park rescues)
• Chehalis, Lewis County, Washington, United States (rescues from floodwaters)
• Whatcom County, Washington, United States (flood warnings, including Nooksack River)