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Atmospheric river turns Western Washington’s rivers into record-breaking floods

Atmospheric river turns Western Washington’s rivers into record-breaking floods

Built World

A rare AR5 'river in the sky' slams the Pacific Northwest, testing levees, towns, and emergency systems from Yakima to the Skagit Valley.

December 11th, 2025: Rivers approach record crest as rain continues and more storms loom

Overview

A 7,000-mile-long atmospheric river has parked over the Pacific Northwest, dumping days of warm rain onto already saturated ground. Rivers from Yakima to the Skagit are surging toward or past record crests, forcing water rescues, cutting off highways, and pushing tens of thousands of people toward higher ground.

Washington's new governor, Bob Ferguson, declared a statewide emergency, activated the National Guard, and asked the White House for fast-tracked federal help. Forecasters warn of "historic" and potentially "catastrophic" flooding in the Skagit and Snohomish basins over the next 72 hours.

Play on this story Voices Debate Who Said What? Predict

Key Indicators

75,000
Residents in Skagit Valley told to prepare for evacuation
Low-lying communities along the Skagit are bracing for record river crests and levee overtopping.
AR5
Atmospheric river intensity rating
Top tier on the 1–5 scale, among the strongest Northwest events since 1959.
20 in
Potential rainfall in Cascades over several days
Mountain slopes could see up to 20 inches, rapidly feeding downstream rivers.
26
Washington rivers at risk of flooding
State officials say dozens of rivers may hit minor to record flood stages.
300
National Guard members mobilizing
Guard units are deploying for sandbagging, evacuations, and infrastructure protection.

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People Involved

Bob Ferguson
Bob Ferguson
Leading statewide emergency response and seeking federal disaster aid
 Robert Ezelle
Robert Ezelle
Coordinating statewide flood response and forecasting worst-hit areas
 Peter Donovan
Peter Donovan
Managing local evacuations and downtown flood defenses
 Gent Welsh
Gent Welsh
Commanding Guard deployment for flood response

Organizations Involved

State of Washington
State of Washington
State government
Leading overall emergency and recovery effort

Washington’s state government is coordinating evacuations, National Guard deployments, and requests for federal aid.
Washington Emergency Management Division
Washington Emergency Management Division
State agency
Coordinating multi-county flood response

The division is the state’s 24/7 hub for warning, coordination, and disaster support.
Washington National Guard
Washington National Guard
State military force
Deploying troops for flood rescue and protection

The Guard is sending troops and equipment to reinforce levees, assist evacuations, and support local responders.
National Weather Service – Seattle
National Weather Service – Seattle
Federal agency office
Issuing flood watches, warnings, and river crest forecasts

The office is tracking the atmospheric river and warning communities about record river crests and landslide risk.

Timeline

  1. Rivers approach record crest as rain continues and more storms loom

    Weather

    The atmospheric river keeps dumping rain; forecasters warn floodwaters will stay high for days and another storm system could arrive by Sunday, prolonging the crisis.

  2. Washington governor declares statewide emergency

    Emergency

    Governor Bob Ferguson proclaims a statewide flooding emergency, activates the National Guard, and announces he will seek an expedited federal disaster declaration.

  3. Skagit County prepares mass evacuations for record crest

    Evacuation

    Officials warn the Skagit could crest 3–5 feet above 1990 records, tell roughly 75,000 residents in low‑lying areas to be ready to evacuate, and recommend upriver communities move to high ground.

  4. Mount Vernon braces as Skagit forecast shatters records

    Local response

    AP/OPB report Skagit River is expected to crest around 47 feet at Concrete and 41 feet at Mount Vernon—“record‑setting forecasts by several feet”—as Mayor Peter Donovan warns of a worst‑case scenario.

  5. ‘Go now’ orders and road closures spread across western Washington

    Impact

    Counties issue immediate evacuation orders in places like Orting, close stretches of Highway 2 and other major routes as mudslides and rising rivers cut off communities.

  6. Heavy rain triggers first rescues and local emergencies

    Impact

    After 5–10 inches of rain in parts of western Washington, rescuers pull residents from flooded areas near Yakima, Naches, Chehalis and along I‑5; multiple rivers hit major flood stage.

  7. Snohomish and Skagit counties declare local flood emergencies

    Emergency

    Snohomish County issues an emergency proclamation as rivers rise, while Skagit County warns of near‑record flooding and urges floodplain residents to prepare for evacuation.

  8. Forecasters flag unusually long, intense atmospheric river

    Weather

    Meteorologists warn a 7,000‑mile atmospheric river could bring record December moisture and widespread flooding to Washington, Oregon, Idaho, Montana, and British Columbia.

Scenarios

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1

FEMA Declares Major Disaster as Skagit and Snohomish Crest Above Records

In this scenario, river crests meet or exceed current forecasts, pushing water over levees in parts of the Skagit and Snohomish basins and inflicting billions in damage on homes, farms, and infrastructure. The scale of loss and the governor’s request prompt a swift major-disaster declaration from the White House, unlocking long-term federal recovery money for buyouts, levee work, and rebuilding—cementing December 2025 as a defining flood in Northwest memory.

Discussed by: Associated Press, Washington State Standard, local emergency officials
Consensus —
2

Back-to-Back Atmospheric Rivers Turn December Into a Multi-Week Flood Siege

Here, the current atmospheric river is followed by another strong system later in December, hitting saturated basins before rivers fully recede. Emergency managers face rotating crises as different watersheds spike in succession, stretching the Guard, stranding communities for longer, and increasing the odds of levee failures and large landslides. The story shifts from a single extreme event to a rolling climate-era siege that tests the limits of Washington’s flood-control infrastructure.

Discussed by: National Weather Service forecasters, Washington Post weather analysts
Consensus —
3

2025 Floods Spark Major Northwest Push for Climate and Flood Resilience

If this flood becomes politically emblematic—like 1996 in Oregon or 2021 in British Columbia—it could galvanize a broad rethink of where and how the region builds. Lawmakers might channel federal and state dollars into buyouts in repeatedly flooded areas, dike and levee redesign, upstream storage projects, and stricter zoning in river plains, while tying it explicitly to climate‑driven increases in atmospheric rivers. The risk is that attention fades once waters recede and other issues dominate.

Discussed by: Climate scientists, regional think tanks, some state and local officials
Consensus —

Historical Context

1996 Pacific Northwest Floods

February 1996

What Happened

A combination of heavy rain and warm temperatures melting mountain snowpacks triggered widespread flooding across Washington, Oregon, and Idaho. Major rivers, including stretches of the Columbia and tributaries near Puget Sound, overflowed, causing hundreds of millions of dollars in damage and federal disaster declarations.

Outcome

Short Term

Communities spent months repairing washed‑out roads, damaged homes, and critical infrastructure.

Long Term

The event spurred upgrades to flood-control works and remains a benchmark for regional flood planning.

Why It's Relevant Today

1996 shows how warm, rain‑on‑snow events can suddenly supercharge Northwest rivers—exactly the fear with today’s warm atmospheric river.

2021 Pacific Northwest and British Columbia Floods

November–December 2021

What Happened

Successive atmospheric rivers pounded southern British Columbia and northwest Washington, breaching dikes, refilling Abbotsford’s former Sumas Lake, cutting off Vancouver from the rest of Canada, and forcing mass evacuations on both sides of the border.

Outcome

Short Term

Transport corridors and supply chains were disrupted for weeks, and thousands of homes and farms were damaged.

Long Term

The disaster triggered multi‑billion‑dollar resilience plans in B.C. and renewed debate over cross‑border flood management.

Why It's Relevant Today

The 2021 floods are the clearest recent example of what a worst‑case atmospheric river can do to this region’s infrastructure and agriculture.

2023 Pacific Northwest Atmospheric River Floods

December 2023

What Happened

An atmospheric river brought record‑breaking rain and unseasonably warm temperatures to Washington and Oregon, killing at least two people and flooding roads and low‑lying communities, though impacts stayed below the devastation of 1996 or 2021.

Outcome

Short Term

Localized damage and fatalities underscored the dangers of warm, rain‑heavy storms in early winter.

Long Term

The event added to a pattern of frequent, intense atmospheric rivers hitting the Northwest within a few years.

Why It's Relevant Today

2023’s floods, followed so soon by 2025, highlight a trend toward more frequent high‑end atmospheric river events in a warming climate.

Sources

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ABC News / Good Morning America Office of the Governor of Washington Washington State Standard OPB / Associated Press The Guardian The Washington Post Wikipedia Snohomish County Government Skagit County Government San Francisco Chronicle People Wikipedia Wikipedia Wikipedia