Snowpocalypse - Photo by E4117

A massive storm packing arctic air moved eastward Sunday, promising a deep chill for two-thirds of the U.S. and heavy snow from Montana to Michigan, according to meteorologists.

The “season’s first significant snow” will begin Sunday in Montana and the Dakotas, according to The Weather Channel. As the storm moves east through Monday, it will pick up strength and drop greater amounts of snow, delivering up to 18 inches around the Great Lakes by Tuesday. Commuters are warned to be careful of slick and slushy roads Monday morning in parts of Minnesota, the Dakotas, northern Wyoming and Montana. The National Weather Service cautioned that high winds would gust the falling or accumulated snow, adding to the dangerous conditions.

The arctic outbreak is also expected to set record low temperatures in some parts of the U.S.

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