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WWUS86 KSEW 091234
SPSSEW

Special Weather Statement
National Weather Service Seattle WA
434 AM PST Tue Dec 9 2025

WAZ001-301>333-101900-
San Juan County-Cascades of Whatcom and Skagit Counties-
Cascades of Snohomish and Northern King Counties-
Cascades of Southern King County-
Cascades of Pierce and Lewis Counties-
Foothills and Valleys of the North Cascades-
Foothills and Valleys of Snohomish and Northern King Counties-
Foothills and Valleys of Central King County-
Foothills and Valleys of Pierce and Southern King Counties-
Foothills and Valleys of Thurston and Lewis Counties-
Lowlands of Western Whatcom County-
Lowlands of Western Skagit and Northwestern Snohomish Counties-
Downtown Everett / Marysville Area-
Shoreline / Lynnwood / South Everett Area-Eastside-City of Seattle-
Lowlands of Pierce and Southern King Counties-
Olympia and Southern Puget Sound-
Lowlands of Lewis and Southern Thurston Counties-
Middle Chehalis River Valley-Willapa and Black Hills-
Southern Hood Canal-Northern Hood Canal-Eastern Kitsap County-
Port Townsend Area-Eastern Strait of Juan de Fuca-
Western Strait of Juan de Fuca-Lake Crescent Area Including US 101-
Olympics-Foothills of the Western and Southern Olympic Peninsula-
Northern Washington Coast-Grays Harbor County Coast-
Lower Chehalis River Valley-Island County-
434 AM PST Tue Dec 9 2025

...HEAVY RAINFALL THIS WEEK WILL LEAD TO AN INCREASED THREAT OF
LANDSLIDES IN WESTERN WASHINGTON...

Rainfall of up to 8 inches over the past several days has increased
antecedent soil moisture to high levels across western Washington.
Heavy rainfall of 1 to 5 inches across the lowlands and 4 to 10
inches over the Olympics and Cascades is expected through late
Wednesday. Wet and unsettled conditions are also favored to continue
through the rest of the week. This amount of rain will put extra
pressure on soil instability, leading to an increased threat of
landslides and debris flows, especially from recent burned areas.

A mudslide has already been reported along I-90 Monday evening near
North Bend, causing closures. More landslides are possible.

Areas most susceptible to landslides debris flows under these
conditions are steep coastal bluffs, other steep hillsides or
road cuts, and recent burned areas. A diminishing threat of
landslides and debris flows will continue for several days after
the rain ends.

For more information about current conditions, visit
www.weather.gov/seattle, select Hydrology, and then scroll down
for the links to the landslide information pages.

For more information on landslides, visit the website for the
Washington State Department of Natural Resources landslide
geologic hazards at: http://bit.ly/2mtA3wn

$$

www.weather.gov/seattle