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