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Storm to chill northwestern US with rain, mountain snow through midweek

By Kyle Elliott, AccuWeather meteorologist

Published May 15, 2017 11:19 AM EDT | Updated May 17, 2017 12:33 AM EDT

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After a stretch of dry and warm weather graced the Pacific Northwest last week, a winterlike chill and damp, dreary conditions will return through midweek.

A major storm system and vortex of chilly air more typical of late winter will traverse the Northwest and northern Rockies into Wednesday.

“It’s been a wet spring so far in the northwestern U.S., and this storm will only add to the surpluses,” according to AccuWeather Senior Meteorologist Mike Doll.

Residents of Seattle and Olympia, Washington, as well as Portland, Salem and Eugene, Oregon, should prepare for travel delays and disruptions to outdoor actiities into Tuesday night.

“Late spring is typically when the Northwest enters the dry season, but wind-driven rain and even a few drenching thunderstorms will batter parts of Oregon, Nevada and far Northern California with wind gusts past 40 mph,” Doll added.

Northwest chilly storm static

However, fans heading out to AT&T Stadium to watch the San Francisco Giants take on the Los Angeles Dodgers early this week can leave the rain gear at home as coastal California should be spared from all but a stray shower.

Temperatures more typical of late winter and early spring will accompany the unsettled conditions and make for a damp and dreary first half of the week.

After reaching the 70s last week, both Seattle and Portland will struggle to reach the middle 50s Tuesday.

“High temperatures will be 10 to 15 degrees below average for this time of year through midweek, allowing snow levels to dip to unusually low territory for May,” said Doll.

Snow levels may dip as low as 4,500 feet in portions of Wyoming and Montana by midweek, threatening cities such as Bozeman, Montana, with a potentially plowable snowfall.

After a seemingly continual barrage of storm systems brought incredible amounts of snow to the mountains of the West this winter, yet another dose of heavy snow is on the way this week.

RELATED:

Strong winds to disrupt midweek travel in the West
Northwest Regional AccuWeather Radar
Detailed Seattle, Washington, forecast

“There can be enough snow at pass level through the Cascades of Washington and Oregon to cause slippery roads and travel delays, while the Bitterroot Mountains in Idaho and far western Montana could see 6-12 of snow through midweek,” Doll stated.

While the snow may cause slippery traveling conditions and heighten the risk for spin-outs and accidents along Interstate 90 from Missoula, Montana, to Snoqualmie Pass in Washington, it will come as a delight to skiers enjoying the extended ski season and eager to return to the slopes.

By late week, an usually heavy late-season snowstorm may unfold in the mountains of southern Wyoming and sneak into the foothills outside of Denver. Over a foot of snow is possible in the hardest-hit areas, and a few wet snowflakes may even mix in with the rain in Denver.

However, drier and milder conditions are expected to return to the Pacific Northwest and northern Rockies by late week.

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