A strong atmospheric river system is forecast to bring heavy rainfall to western Washington from Monday, December 8, through Wednesday, December 11, 2025, raising concerns about widespread flooding and landslides across the region.
According to the National Weather Service Seattle, the prolonged rainfall may lead to significant river flooding, urban flooding, and landslides, especially in areas with saturated soils and steep terrain. Forecast maps show the highest rainfall totals expected along the coast and in the Cascade foothills.
Residents are urged to take preparedness measures, including:
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Monitoring local weather alerts and river forecasts
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Avoiding driving through flooded roadways
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Being prepared for potential evacuations in flood-prone neighborhoods
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Securing outdoor belongings and clearing storm drains
Officials emphasize that flooding can occur rapidly and advise the public to stay informed through official channels. Updated river forecasts can be found at the National Weather Service’s website.
Authorities across western Washington continue to monitor conditions closely as the storm system progresses. Stay tuned for additional updates as the situation develops.
⚠️ A strong atmospheric river event will bring heavy rain to western Washington today through Wednesday, leading to potential for significant river flooding, urban flooding, and landslides. Check the latest river forecasts here: https://t.co/JbmWFb3hB8 #WAwx pic.twitter.com/C2JcNh1L1j
— NWS Seattle (@NWSSeattle) December 8, 2025