45 atmospheric rivers impacted Washington state between October, March

Five regional events were considered “extreme,” including an atmospheric river that ripped through western Washington in December 2025.

SEATTLE — The Center for Western Weather and Water Extremes released an update on atmospheric rivers Tuesday, highlighting impacts felt along the West Coast through parts of 2025 and 2026. 

Most of the annual rainfall across the studied area fell in the “weak” to “moderate” category. 

RELATED: Hurricane Hunters take on atmospheric rivers to improve West Coast forecasts

Five regional events were considered “extreme,” including an atmospheric river that ripped through western Washington in December 2025, triggering historic floods.  

Forty-five atmospheric rivers

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