The image, taken by NASA's GOES-13 satellite, shows the low-pressure system hitting the Midwest today, with heavy snow in Iowa, Minnesota, and Wisconsin, but also pounding the Big Sky region, from Montana all the way down to Arizona. That's all moving east as well, into the Tennessee valley and soon up the coast to the Northeast. All in all, about a third of the continental U.S. is going to get absolutely pounded.
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