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Politics : Evolution
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To: Brumar89 who wrote (65073)1/22/2015 6:40:03 PM
From: TigerPaw  Read Replies (1) of 69300
 
Here is a description of the polar vortex.
crh.noaa.gov

Note the last picture where it shows the influx of Pacfic air pushing the vortex into North America.

Smaller influx leads to cool fronts, not the headline grabbing freezes, but they are essentially the same.
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