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A brutal polar vortex sent temperatures plummeting to “life-threatening” lows across the Midwest and Northeast on Saturday, with millions of Americans warned of frostbite and other dangers.
The coldest air mass of the winter brought the thermometer down to minus 6 degrees overnight in Minneapolis, while New Yorkers were urged to take “extreme precautions” against wind chill.
New York City Mayor Bill de Blasio urged residents to check on vulnerable friends, relatives and neighbors.
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Polar Vortex causing extremely low tempertures
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