Seattle weather blog: Western Washington snow forecast

Whatcom and Skagit counties could see 1-2 inches of snow this weekend as snow levels drop to 500 feet for the interior of the northwest.

SEATTLE — An extended weather pattern is expected to develop this weekend into next week, bringing cold air and snowy areas in the lowlands to western Washington just in time for holiday travel. rest.

Confidence is growing that winter weather will hit some lowlands between Sunday and Thursday.


Cold, below-average air is forming near the North Pole. This air is currently bottled but part of it will break off, moving south towards the lower 48th of the United States.

The coldest air will be over the eastern part of the Pacific Northwest, but some cold air will find its way to western Washington starting late Sunday, lasting much of next week. Temperatures will run nearly 10 degrees below average for highs.

At the same time, some minor disturbances will move beyond the Pacific toward the region bringing lift and moisture into the cold air, setting the stage for some opportunities for lowland snow to begin later in the day. Saturday and continue until the end of next week.

Some build-up may occur, which may lead to some travel disruption on the road and at the airport.


saturday to sunday

The first chance for winter weather came late Saturday, mostly for Whatcom, Skagit and San Juan counties at elevations above 500 feet. Snow levels look set to drop to as low as sea level on Sunday as the Fraser Valley allows cooler air to filter into Whatcom County.

The winter mix will extend further south into Snohomish, King and Pierce counties above 1,000 feet on Sunday.

Light buildup up to 1 to 2 inches is mainly possible for Whatcom and Skagit counties.


The colder air moved deeper into the Puget Sound lowland, reducing snow levels for Snohomish, King, Pierce, Thurston and Kitsap counties on Monday. Snow levels will drop to about 500 feet for locations south of Everett with snow levels falling to 200 feet north of Everett. Whatcom County will see snow levels near sea level on Monday.

With the air getting colder and the amount of snow falling, the humidity starts to drop as well. Scattered low-lying sleet is possible across the region on Monday with small, light accumulations of rain for areas that could see blizzard.


Additional humidity will arrive on Tuesday with cold air still in place, increasing the chance of snowfall for all of western Washington. Snow levels will hover about 200 feet south of Everett and near sea level north of Everett. Although snow levels are about 200 feet high near Seattle, any more heavy rainfall that develops could reduce snow levels to sea level in the Seattle metropolitan area by Tuesday.

Snow appears to be widespread and is occasionally moderately likely to result in accumulation. It’s too early to know the specifics of accumulation but it looks like a few to a few inches of reduction could be possible for some low-lying areas away from the water, with a preference for Whatcom County and the Kitsap Peninsula. Some accruals are also possible in or near Seattle, Everett, Bellevue, Tacoma, and Olympia.

Wednesday to Thursday

Wednesday to Thursday looks to be a transition day as another system approaches, pulling in a warm front late on Wednesday. This will increase the humidity and start to raise the temperature.

A mix of winter rain, freezing rain, sleet and snow is possible for the Puget Sound lowlands from Wednesday evening to Thursday morning. The forecast is a bit complicated because it’s far away but the South and Central Sound could see snow turn to freezing rain and eventually rain through Wednesday night.

Further north towards the North Sound, snow is forecast for Wednesday night through Thursday morning before turning into a winter mix throughout Thursday and all-out rain late Thursday as temperatures continue to fall. continue to increase.

Snow and ice accumulation is highly uncertain during this time frame.


The event is still several to several days away so confidence in the cumulative projections is lower and it is too early to pinpoint the exact accumulations but some accumulation is expected.

Favorite areas to see snow accumulation are in Whatcom, Skagit and San Juan counties over the weekend. Finally, parts of the Puget Sound lowland and the Kitsap Peninsula, including Seattle, Everett, Bellevue, Tacoma and Olympia, will accumulate on Tuesday. Roads and airports in the area may at least be disrupted to travel.

The mountain passes will see at least a few inches of snow beginning late Saturday with additional snow accumulation throughout next week. This can disrupt travel, so check for the latest passing conditions before heading over the mountains on vacation.

This is a flexible and subject to change forecast, so keep checking back as KING 5’s First Warning Weather Team continues to finalize forecasts over the coming days. Seattle weather blog: Western Washington snow forecast

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