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Polar vortex: extremely cold weather hitting most of US this week - TomoNews #polarvortex

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BOSTON — A large part of the U.S. is preparing for the coldest December in years after the polar vortex made a comeback. The polar vortex is located in the middle and upper tropospheres and extends into the stratosphere. It is in fact a band of low pressure Arctic air normally centered... (más)

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