CNNのインスタグラム(cnn) - 2月5日 01時05分

This NASA animation shows what the polar vortex looked like as it barreled across the US last week, bringing dangerously cold weather to nearly three-quarters of the population. The polar vortex, as its scary-sounding name suggests, is essentially a mass of bitterly cold Arctic air that dipped into the Northern Hemisphere last week.
(?: NASA/JPL-Caltech AIRS Project)

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• NASA