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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.

http://www.wusa9.com/video/3020872156001/1/What-is-the-polar-vortex-thats-making-us-so-cold http://videos.usatoday.net/Brightcove2/29906170001/2014/01/29906170001_3019889404001_th-52cb2fe0e4b057643f8db1c8-1083021586001.jpg?pubId=29906170001 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. POLAR VORTEXwxiaweatherNational NewsVPCWXcold weather 01:08

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