A snow-covered Jeremy Buckta snowblows his driveway in whiteout conditions during a snowstorm in Manitowoc, Wisconsin. Photo: AP

Polar vortex: temperatures to plunge to -40 degrees Celsius as arctic chill sweeps over US Midwest

  • The brutal blast known as the polar vortex is a mass of freezing air that normally spins around the stratosphere over the North Pole
  • Officials warned Chicago residents, accustomed to chilling winters, to expect an unusually deep and dangerous freeze
Topic |   Extreme weather

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A snow-covered Jeremy Buckta snowblows his driveway in whiteout conditions during a snowstorm in Manitowoc, Wisconsin. Photo: AP
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