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sn dnt polar vortex explained _00000616.jpg
sn dnt polar vortex explained _00000616.jpg

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    Polar temperatures are coming back

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Polar temperatures are coming back

What exactly is the "Polar Vortex"? CNN's Jennifer Gray explains what is behind this weather phenomenon.

Polar temperatures are coming back

What exactly is the "Polar Vortex"? CNN's Jennifer Gray explains what is behind this weather phenomenon.