NASA satellite imagery shows a powerful atmospheric river transporting large amounts of moisture from the Pacific Ocean into the Pacific Northwest, contributing to heavy rainfall and flooding across Washington state in December 2025.
By SHR Media Staff
A powerful atmospheric river that delivered intense rainfall to western Washington has prompted a statewide emergency declaration and driven major flooding, mudslides and infrastructure impacts across the region.
Heavy rain beginning in early December caused multiple rivers to rise rapidly, inundating low-lying areas, forcing evacuations and closing key transportation routes. Emergency officials warn additional rainfall may prolong flood risks in the coming days.
Statewide Emergency Declared
Washington Governor Bob Ferguson issued a statewide emergency proclamation in response to the extreme weather and its impacts. The declaration authorizes activation of state emergency plans, deployment of resources to assist local jurisdictions, and support from the Washington National Guard.
The document cites widespread hazardous conditions including flooding, landslides, erosion and damage to public infrastructure and private property.
The emergency measures also include temporary waivers for certain transportation regulations to support relief efforts.
Flooding and Infrastructure Disruption
Floodwaters have inundated residential neighborhoods and key transportation corridors. Major highways, local roads and rail lines have been closed due to standing water, debris and damage. Emergency managers reported significant water levels on rivers including the Skagit and Snohomish, with some rivers reaching historically high stages.
Landslide risks remain elevated in areas with saturated soils, and power outages have affected portions of the region due to high winds and storm debris.
Impact on Residents and Evacuations
Authorities issued evacuation orders and advisories in several counties. Emergency shelters have been established for residents displaced from flood-threatened areas.
Officials continue to monitor river levels and warn residents to stay alert to official notices.
Atmospheric River Details from NASA Observation
According to a NASA Earth Observatory report, the atmospheric river responsible for the heavy rainfall originated as a long plume of concentrated moisture spanning thousands of miles across the Pacific. Satellite-derived data indicated that some locations in western Washington received more than 10 inches of rain over a 72-hour period, contributing to the flooding.
The NASA report also noted extensive moisture transport through the atmosphere and said river flooding and mudslides were ongoing, with several roadways closed due to storm effects.
Outlook
While rainfall briefly eased as the atmospheric river moved inland, forecasters have warned that additional storm systems could bring more precipitation to the Pacific Northwest. Officials continue to monitor conditions and urge residents in flood-prone areas to remain aware of potential hazards.
SHR Media will continue to follow verified updates and post new information as it becomes available.
Sources
- Governor Bob Ferguson Emergency Proclamation 25-07, Office of the Governor of Washington
- Pacific Moisture Drenches the U.S. Northwest, NASA Earth Observatory NASA Science
- Washington State Emergency Management Division
- National Weather Service
- Associated Press
- Reuters
- 2025 Pacific Northwest floods, Wikipedia overview
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