NPR - A polar vortex will usher in frigid temperatures and life-threatening conditions for millions of Americans this weekend and into next week. During the winter, the polar vortex, which is an area of low pressure and cold air that surrounds the Earth’s poles, can expand. Areas like the South and Mid-Atlantic, which are unaccustomed to freezing, will not be spared. Trump’s second swearing-in on Monday will feature the coldest air of the season in Washington, D.C. It is expected to be the coldest Inauguration Day since President Ronald Reagan's in 1985 when, by noon, temperatures only reached 7 degrees, according to historical data.
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