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January 6th, 2014
11:53 PM ET

This is what a polar vortex looks like

Bone-chilling cold is gripping much of the country. Some areas are seeing their lowest temperatures in 20 years. Authorities already blame the cold for at least 13 deaths. This phenomenon is the result of a polar vortex – a mass of frigid swirling air from the north. Stephanie Elam takes a look at some of the worst weather in America.

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Filed under: Stephanie Elam • Weather
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