‘Polar Vortex’ brings big freeze In America – Wind Chill -40

polar vortex, wind chill -40,

Ice builds up along Lake Michigan as temperatures dip well below zero in Chicago, Illinois. A pool of cold, dense air known as a “polar vortex” has been sweeping through northern and central parts of the United States and has sent temperatures plummeting to their coldest in 20 years.

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