'Polar Vortex' Event Paltry Compared to Past Freezes

LiveScience.com
'Polar Vortex' Event Paltry Compared to Past Freezes
NOAA's GOES-East satellite captured this photo of the polar vortex over the Northern United States on Jan. 6, 2014, at 11:01 a.m. EST (1601 GMT).
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