This NASA animation reveals what the polar vortex seemed like because it barreled acros…

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This NASA animation reveals what the polar vortex seemed like because it barreled throughout the US final week, bringing dangerously chilly climate to just about three-quarters of the inhabitants. The polar vortex, as its scary-sounding identify suggests, is actually a mass of bitterly chilly Arctic air that dipped into the Northern Hemisphere final week.
(?: NASA/JPL-Caltech AIRS Undertaking)