Millions of Americans braced Tuesday for a dangerous polar vortex which began to settle over a large swath of the United States, threatening to set new records as schools and businesses closed and authorities warned of frostbite. The National Weather Service (NWS) forecast temperatures between -10 to -40 degrees Fahrenheit (-23 to -40 Celsius) by Wednesday, with wind chill making it seem as cold as -65 degrees Fahrenheit in one area of Minnesota. The culprit was a lobe of arctic air broken away from the polar vortex that usually encircles the North Pole.
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