A stormy Thanksgiving weekend is forecast for the Pacific Northwest, as a succession of Pacific fronts bring heavy rain, strong gusts, and increasing mountain snow from Friday to Sunday. By early next week, the trend will slow as it travels across major passes, triggering the coldest air of the season.
According to the National Weather Service offices in Seattle, WA, and Pendleton, OR, a series of moisture-laden systems will move inland throughout the weekend, keeping conditions wet west of the Cascades and snowy above 3,000 feet. Mount Hood, Snoqualmie, and Stevens Pass could get considerable snowfall by Sunday night, while lower valleys could experience heavy rain with gusts up to 45 mph near the coast.
The Washington State Department of Transportation cautions about challenging mountain traffic, especially along I-90 and U.S. 2, where they anticipate chain requirements and reduced visibility. ODOT tells drivers in western Oregon to expect ponding water and probable localized flooding on I-5 and I-84 as rainfall exceeds 2 inches in some spots.
By Monday, a rush of colder air behind the leaving system will push snow levels closer to 1,500 feet, creating a wintry atmosphere even in foothill communities. Travelers returning from vacation are advised to check pass reports, bring emergency supplies, and allow additional time as temperatures drop dramatically overnight.
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