Winter Weather Advisory issued December 17 at 9:04PM PST until December 18 at 10:00AM PST by NWS Seattle WA
Issue date: 2025-12-18T05:04+00:00
* WHAT...Snow expected. Total snow accumulations up to 5 to 10 inches. Winds may gust up to 35 mph this afternoon. * WHERE...Cascades of Snohomish and Northern King Counties, Cascades of Whatcom and Skagit Counties, Cascades of Pierce and Lewis Counties, and Cascades of Southern King County. * WHEN...Until 10 AM PST Thursday. * IMPACTS...Travel could be very difficult. Strong winds could cause tree damage. * ADDITIONAL DETAILS...Snow levels will increase Thursday morning to around 6000 feet, which could bring a brief period of freezing rain. Confidence is low for freezing rain, but the potential exists for light accumulations.
Wind Advisory issued December 17 at 6:08PM PST until December 18 at 11:00PM PST by NWS Seattle WA
Issue date: 2025-12-18T02:08+00:00
* WHAT...South winds 15 to 25 mph with gusts up to 45 mph expected. * WHERE...Island County, Lowlands of Western Skagit and Northwestern Snohomish Counties, Lowlands of Western Whatcom County, and San Juan County. * WHEN...From 6 AM to 11 PM PST Thursday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Due to saturated soils, increased impacts from higher winds are possible.
Flood Warning issued December 17 at 4:27PM PST until December 19 at 6:33AM PST by NWS Seattle WA
Issue date: 2025-12-18T00:27+00:00
...The Flood Warning is extended for the following rivers in Washington... Snoqualmie River Near Carnation affecting King County. ...The Flood Warning continues for the following rivers in Washington... Snoqualmie River Near Snoqualmie Falls affecting King County. Snohomish River Near Monroe affecting Snohomish County. Snohomish River At Snohomish affecting Snohomish County. ...The Flood Warning is cancelled for the following rivers in Washington... Skykomish River Near Gold Bar affecting Snohomish County. .Rainfall yesterday and overnight is driving area rivers back up with new rounds of flooding occurring or upcoming. Rain will return tomorrow but it will not be enough to cause river level to return above flood stage. * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Snohomish River at Snohomish. * WHEN...Until Friday morning. * IMPACTS...At 28.0 feet, the Snohomish River will flood several roads...including the Snohomish-Monroe highway and Riverview Road...and low areas of the lower Snohomish valley that are not protected by levees. A stage of 28 feet on the Snohomish River corresponds to a Phase 3 in the Snohomish County flood program. * ADDITIONAL DETAILS... - At 4:00 PM PST Wednesday the stage was 27.7 feet. - Flood stage is 25.0 feet. - Forecast...The river is expected to rise to a crest of 28.0 feet late this afternoon. It will then fall below flood stage tomorrow afternoon. - http://www.weather.gov/safety/flood
Special Weather Statement issued December 17 at 3:33PM PST by NWS Seattle WA
Issue date: 2025-12-17T23:33+00:00
Significant rainfall over the past week has increased soil moisture to high levels across western Washington. Additional rainfall of 1 to 2 inches is expected through Friday. This amount of rain will continue to put extra pressure on soil instability, leading to an increased threat of landslides and debris flows, especially from recent burned areas, with this new rainfall acting as a trigger. Numerous landslides have already occurred in Whatcom, Skagit, King Counties and others. More landslides continue to be 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
