In the news: polar vortex
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In an unusual event, temperatures dropped below freezing in all 50 states Tuesday after a polar vortex swept southwards. As NBC New York explains, “The polar vortex forms every year to the north, but large blocks of high pressure over Greenland and the Southwest weakened the jet stream in recent days, allowing part of the polar vortex to break off from a parent system and dip in to the US.”
While the worst of it is over, we highly recommend you stay indoors and just look at winter images: