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July 22, 2014

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Snow falls on Metro Detroit, Monday, Jan. 6, 2014, in Detroit. A whirlpool of frigid, dense air known as a "polar vortex" descended into much of the U.S. and plunged temperatures to record lows.

Detroit Free Press, Jarrad Henderson / AP

Snow falls on Metro Detroit, Monday, Jan. 6, 2014, in Detroit. A whirlpool of frigid, dense air known as a "polar vortex" descended into much of the U.S. and plunged temperatures to record lows.