It can swallow half a continent in one bite, but there's a lot more than just weather behind this wintry beast.
via Discovery News http://news.discovery.com/earth/weather-extreme-events/polar-vortex-behind-us-cold-blast-140106.htm#mkcpgn=rssnws1
via Discovery News http://news.discovery.com/earth/weather-extreme-events/polar-vortex-behind-us-cold-blast-140106.htm#mkcpgn=rssnws1
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