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A blast of brutally cold air - thanks to the polar vortex - is roaring across the central and eastern USA early this week, sending temperatures to levels not seen in 20 years. The polar vortex is a strong area of low pressure that usually wanders around the Arctic throughout the winter. This week, the core of the vortex has actually slipped all the way down over the USA.
|What Is The Polar Vortex?|
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