Snow and locally gusty winds will spread rapidly across Washington, Idaho, Montana and Wyoming this weekend, making for slippery travel.
The some of the heaviest snow is forecast to fall on Snoqualmie and Lookout passes along I-90 in Washington and Montana, respectively. Motorists traveling through these areas should expect delays and restrictions due to 6 to 12 inches of snow with blowing and drifting.
Motorists who must travel cross country may want to take a more southern route such as I-84 to I-80.
Most of the snow will fall over the mountains in the Northwest and northern Rockies, but not all of it.
Light to moderate snow is forecast to fall over much of central Idaho and western Montana. A moderate amount of snow is expected around Spokane, Wash.
Some snow will also reach southward into part of the Oregon Cascades and Blue Mountains, as well as the Tetons in Wyoming, the Rockies in Colorado and the Wasatch in Utah.
Several inches of snow will blanket Missoula and Bozeman, Mont.
A small amount of snow can coat the ground around Boise and Pocatello, Idaho, and around Salt Lake City.
Rain is in the offing in coastal Washington from Bellingham to Seattle and Tacoma and southward to Portland, Ore. Mostly rain showers are likely around The Dalles and Pendleton, Ore.
During Sunday into Monday, some snow will swing out over the northern and central Plains to the Upper Midwest. Only spotty snow is forecast in these areas, but gusty winds may cause some problems for travelers on I-90 and I-94.
The storm will bring a fresh dose of snow for ski resorts in the Rockies that will be open for the Thanksgiving weekend.
The storm will usher in a new wave of cold air from the northern Plains to the East next week.
Despite indications from earlier this past week, it now appears the brutally cold air will stay north of the Canada border. However, the new cold wave will still have a bite in the Central and Eastern United States, shaving temperatures by 20 to 30 degrees from weekend highs.