National Weather Service issues flood watch for Whatcom County

WHATCOM COUNTY, Wash. — The National Weather Service Seattle office issued a flood watch for western Washington counties from King County to the US-Canada border, including Whatcom County. It will be in effect from late tonight, Friday, October 31, 2025, through 4am Sunday morning.

Flood Watch issued October 31 at 1:34PM PDT until November 2 at 4:00AM PST by NWS Seattle WA

WHAT…Flooding caused by excessive rainfall is possible.

WHERE…Portions of northwest and west central Washington, including the following counties, in northwest Washington, Mason, Skagit and Whatcom. In west central Washington, King and Snohomish.

WHEN…From late tonight through late Saturday night.

IMPACTS…Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Where heavy rain occurs, the relatively high rain rates could produce flash flooding/debris flows on the more sensitive burn scars. It could also cause ponding or nuisance flooding in urban areas and small streams where drainage is poor or drains are clogged by leaves.

ADDITIONAL DETAILS…

Rainfall forecasts between 3 to 5 inches with locally higher amounts possible through Saturday night. Snow levels will range from 8000 to 9000 feet. This amount of rainfall will drive some of the rivers in the watch area to near flood stage. The most likely rivers to reach flood stage is the Skokomish, Snohomish, Skykomish, and Snoqualmie, and to a lesser extent, the Skagit, Stillaguamish, and Nooksack rivers.

http://www.weather.gov/safety/flood

Instructions
You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
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– National Weather Service (October 31, 2025)