canada: The polar vortex is an icy cap of air that usually swirls over the North Pole, according to Nine News Australia. Changing air currents caused it to slip down through Canada and into the US Midwest this week. To improve your experience update it here News WorldUS polar vortex 'just sort of evaporates'By AAP2 19am Feb 1, 2019Facebook Tweet Mail The polar vortex that locked the US Midwest in sub-zero weather and led to the deaths of at least 21 people will give way to milder, snow-melting temperatures this weekend. The cold air isn't pushing off anywhere, it's just sort of evaporating, said Brian Hurley, a meteorologist with the National Weather Service's Weather Prediction Centre in College Park, Maryland. It'll feel like a heat wave. So we're going from minus 29C in Chicago Thursday morning to near 10C above on Monday, he said.
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