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Chilly air and more snow for Seattle, Northwest US through weekend; eyeing next storm at midweek

November 04, 2017; 12:50 PM

Another storm system is set to arrive in the northwestern U.S. Saturday night and will bring another round of snow for the region.

This storm will come on the heels of the storm system that came through Thursday night and Friday. The Cascades saw some snow with highest amount just shy of a foot and a half.

Seattle also reported it's first trace amount of snow for the season on Friday.

 Snowfall reports from NWS Seattle Thurs. night to Fri.


 Amount (Inches)

 Wells Creek Snotel




3 miles southwest of Port Angeles 


 Rainier Paradise Ranger Station


 Snoqualmie Pass


 Seattle-Tacoma Airport


The upper-level energy associated with this storm is now long gone, moving across the far northern Plains and southern Canadian Prairies at this time. However, another storm system is quickly moving in from the north.

nw storm 1 2

Upper-level energy associated with storm #1 is gone but another feature will drop down into the Northwest later Saturday.

Upper-level energy will dive southward over the Northwest through the rest of Saturday and will help strengthen a surface low pressure system off the coast of Washington. This low will move inland around Portland and the Columbia Gorge.

Chilly air is already in place but this low will help pull even colder air southward. Some snow is expected to fall in Seattle again as snow levels look to drop to or slightly below 500 feet in the Seattle area Saturday night into Sunday morning. There will likely be a coating to an inch or two on grass and non-paved surfaces away from the sound and downtown.

Across the higher elevations of the Washington Cascades, 6 to 12 inches is expected. Travel through the passes will be slippery as roadways will be snow-covered.

nw storm graphic

The heaviest snow is expected across the Oregon Cascades where the core of the moisture will be directed. A general 12 to 18 inches of snow is expected in the highest elevations.

Precipitation will lessen through the day Sunday as the storm moves east and weakens. Monday and Tuesday should turn out to be dry as an upper-level ridge temporarily builds in. Temperatures should start to rise closer to normal during this time.

Models are in agreement that another strong upper-level feature and connected surface low will approach at midweek. This feature will be moving a bit slower as it comes into the Northwest Wednesday through Thursday.

It also will be farther west than the previous two storms and will be over the open water of the Pacific so will not pack much, if any, cold air with it. However, it will pack plentiful moisture with it so a round of high elevation snowfall and coastal and valley rain is expected for the Northwest into northern California.

gfs model jr

Models are in agreement another upper-level low will drop into the Northwest at midweek.

gfs model jr nw

Rain and high elevation mountain snow will begin late Wednesday across the Northwest.

The views expressed are those of the author and not necessarily those of AccuWeather, Inc. or AccuWeather.com

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