A powerful series of atmospheric rivers triggered widespread flooding across Washington state in December 2025, forcing evacuations, closing roads and prompting a major state emergency response. Governor Bob Ferguson declared a statewide emergency on December 10 and activated the Washington National Guard as rivers across western Washington rose to major or record flood levels.
The emergency unfolded over several days rather than as a single flood crest. Forecasts changed rapidly as heavy rain continued, and some early projections for the Skagit River were substantially higher than the levels ultimately observed. Even so, the event produced record river levels and extensive damage across Washington.
Atmospheric Rivers Drive Major Flooding Across Washington
The December storm sequence brought extreme rainfall, saturated soils, landslides, high winds and river flooding to a broad section of the state. Washington's emergency proclamation described an atmospheric-river and winter-weather event producing extreme rainfall and hazardous conditions affecting homes, agriculture, businesses and transportation systems.
On December 10, Ferguson declared a statewide emergency and said the state would seek an expedited federal emergency declaration. The governor also activated the National Guard and said state officials were coordinating with local and Tribal governments, the National Weather Service, FEMA Region 10 and the U.S. Army Corps of Engineers.
Skagit River Forecasts Prompt Urgent Evacuations
Skagit County became one of the focal points of the emergency. On the morning of December 10, county officials said the National Weather Service was forecasting the Skagit River near Concrete to crest at 47.62 feet early on December 11, while the river at Mount Vernon was forecast to reach 41.54 feet on December 12. Both projections would have exceeded previous records by several feet.
Those numbers were forecasts, not observed river levels. Officials nevertheless treated the projections as an immediate public-safety threat. Skagit County advised upriver communities including Rockport, Hamilton, Marblemount and Concrete to evacuate to higher ground and told residents within the 100-year floodplain to prepare for evacuation.
Later that day, the county escalated its warning to a Level 3 "GO" evacuation for residents in the 100-year floodplain, instructing them to leave for higher ground immediately.
The Skagit River Did Break Records — But Below the Most Extreme Forecasts
The original forecasts evolved as the event progressed. The Skagit River did not ultimately reach the early projection of roughly 47 feet at Concrete. According to Skagit County's December 12 update, the river crested at 41.1 feet at Concrete on December 11 and 37.73 feet at Mount Vernon shortly after midnight on December 12.
Those levels were still historic. For comparison, county officials reported that the previous 2021 records were 38.93 feet at Concrete and 33.11 feet at Mount Vernon. Flooding spread across the Skagit Valley, and additional evacuation notices were issued in Burlington as water affected the Gages Slough area.
This distinction matters during fast-moving disasters: river forecasts are projections based on rainfall, runoff, reservoir conditions and other variables, and they can change substantially before the water actually crests.
National Guard and Emergency Crews Mobilized
Washington mobilized National Guard personnel for life-safety missions as flooding expanded. The state's emergency proclamation authorized Guard members to serve on temporary state active duty to protect life, property and public safety.
The response ultimately grew well beyond the first days of the Skagit emergency. In a later state assessment, Ferguson's office said approximately 400 Washington National Guard soldiers and airmen supported flood mitigation, evacuations, sandbagging, aviation rescue, debris removal and other lifesaving operations during the December storms.
Flooding Became a Statewide Disaster
What initially appeared as a series of regional flood emergencies developed into a much larger statewide disaster. Atmospheric-river activity continued into mid-December, putting additional pressure on already saturated river systems and levees.
In its subsequent disaster assessment, Washington reported that three of the state's largest rivers — the Skagit, Snohomish and Cedar — reached their highest recorded levels. Thirty-three rivers exceeded flood stage, including 18 that exceeded major flood stage.
The state later reported more than 100,000 people under evacuation orders during the broader storm sequence, approximately 1,000 assisted evacuations and 383 emergency rescues. About 3,891 homes were damaged statewide, including 440 that were destroyed or sustained major damage. One fatality was attributed to the disaster, while roughly 450,000 customers experienced power outages at some point during the storms.
Transportation was also heavily disrupted. State officials said 34 state-managed routes were severely affected, including portions of two interstate highways and three U.S. highways, while Amtrak Cascades service between Seattle and Vancouver, British Columbia, was suspended for several days.
Why Atmospheric Rivers Can Produce Extreme Flooding
Atmospheric rivers are long, relatively narrow corridors of concentrated water vapor transported through the atmosphere. When that moisture reaches mountainous terrain such as the Cascades and is forced upward, it can produce prolonged and exceptionally heavy precipitation.
Flood severity depends on more than rainfall totals alone. Antecedent soil saturation, snow levels, reservoir conditions, the timing of successive storms and the ability of rivers and levees to handle sustained high flows can all influence the outcome. During the December 2025 sequence, repeated storms kept waterways elevated and soils saturated, increasing the risk of flooding and landslides.
Climate Change and Atmospheric-River Risk
A warmer atmosphere can hold more water vapor, providing more moisture for extreme precipitation when favorable storm conditions develop. Research on atmospheric rivers indicates that warming can increase their moisture transport and precipitation potential, although the effects vary by region, storm track and individual event.
That broader scientific relationship should not be confused with attributing every aspect of a particular flood to climate change. The severity of an individual disaster reflects a combination of meteorological conditions, terrain, river management, infrastructure and long-term climate trends.
Recovery and Federal Disaster Assistance
As floodwaters receded, the response shifted toward damage assessment and recovery. Skagit County eventually lifted its flood-related evacuation notices after the river dropped below flood stage, while warning residents about contaminated water, damaged roads and other hazards.
The scale of the statewide damage became clearer in the following weeks. On January 21, 2026, Ferguson formally requested a federal major disaster declaration and sought FEMA Individual Assistance for affected residents and Tribal nations. The state described the December 5-22 period as a series of catastrophic atmospheric rivers and winter storms that caused flooding, landslides, power outages and widespread damage.
In February, Washington submitted a separate request for FEMA Public Assistance after preliminary assessments conducted with FEMA identified approximately $182.3 million in damage to public infrastructure.
What the December 2025 Floods Showed
The Washington floods demonstrated both the danger of consecutive atmospheric rivers and the importance of distinguishing emergency forecasts from final observed outcomes. Early Skagit River forecasts prompted urgent evacuations because they indicated potentially unprecedented conditions; the eventual crests were lower than the most extreme projections but still broke records and produced serious flooding.
For residents during future flood events, official National Weather Service forecasts and warnings, county emergency alerts and evacuation instructions remain the most important sources for immediate decisions. Conditions can change quickly, and a forecast that is later revised can still justify precautionary action when lives are at risk.
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