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What is the polar vortex that's making us so cold???

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.

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What is the polar vortex that's making us so cold???

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. VPC