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|Polar vortex expected to paralyze parts of U.S. with extreme cold|
Temperatures are expected to plummet Wednesday as parts of the Midwest and East are overwhelmed by the polar vortex dropping down from the North Pole. Chicago, the nationâ€™s third-largest city, will be colder than parts of Antarctica, Alaska and the North Pole as the â€œhighâ€ temperature should be around 10 below zero, while the overnight low into Thursday is forecast to be in the 25-below range, according to the National Weather Service in Chicago. Late Tuesday, Amtrak canceled all train service to and from Chicago. The upcoming bitter cold also prompted the USPS to cancel mail delivery to large swaths of seven states and airlines have already canceled more than 1,400 flights, according to flight tracker FlightAware.
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