Grand Central Station

Polar Vortex Weather System Brings Artic Temperatures Across Wide Swath Of U.S....NEW YORK, NY - JANUARY 07:  Commuters walk through Manhattan's Grand Central train terminal on January 7, 2014 in New York City. A 'polar vortex'  of frigid air centered on the North Pole dropped temperatures to a record low 4 degrees in New York City.

John Moore/Getty

Commuters find refuge in Manhattan’s Grand Central train terminal as temperatures drop below freezing in New York city.