The Midwest's worst cold snap in two decades was created by the polar vortex, a reservoir of icy air that usually swirls over the North Pole. Shifting air currents caused it to slip down through Canada and into the US Midwest this week.
from World News Headlines, Latest International News, World Breaking News - Times of India http://bit.ly/2G6f9gO
Saturday, February 2, 2019
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