WHATCOM COUNTY, Wash. — The Seattle office of the National Weather Service issued a flash flood watch Thursday, July 31, 2025, for eastern Whatcom and Skagit Counties through 5am on Friday August 1, 2025.
Flash Flood Watch issued July 31 at 10:07AM PDT until August 1 at 5:00AM PDT by NWS Seattle WA
Thunderstorms will develop over the Cascades this afternoon and tonight. Storms will be slow-moving and produce high rain rates,allowing for potential flash flooding over area burn scars.
WHAT…Flash flooding and debris flows caused by excessive rainfall continue to be possible over the Sourdough, Easy, Chilliwack, and Suiattle-Boulder-Toketie burn scar.
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Click for more informationWHERE…A portion of northwest Washington, including the following areas, Cascades of Whatcom and Skagit Counties and Foothills and Valleys of the North Cascades.
WHEN…Through late tonight.
IMPACTS…Heavy rainfall over the Sourdough, Easy, Chilliwack, and Suiattle-Boulder-Toketie burn scars is expected up to and during the period of the watch. Residents and travelers near the Sourdough, Easy, Chilliwack, and Suiattle-Boulder-Toketie burn scar should prepare for potential flooding impacts. Be sure to stay up to date with information from local authorities.
Heavy rainfall could trigger flash flooding of low-lying areas,urbanized street flooding, and debris flows in and near recent wildfire burn scars.
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