Arctic temperatures, snow and flooding sweep across the U.S.

Wintry weather is sweeping across parts of the United States this weekend, bringing with it brutally low temperatures.

Sixty million people from the Northern Plains through the Southeast are under cold weather alerts, including Minneapolis, Chicago, St. Louis, Memphis, Huntsville and Myrtle Beach.

Dangerously cold wind chills are expected to hit these areas, with the National Weather Service issuing some alerts that run into Monday morning.

People walk in cold weather along the Brooklyn Bridge on Dec. 8 in New York City.

Spencer Platt / Getty Images

The most extreme temperatures will hit the Northern Plains and Midwest on Saturday night, where overnight temperatures could dip as low as -25 degrees.

Wind chills will make it feel like -30 to -35 degrees in the Dakotas, Minnesota and Wi