below freezing

File photo of a tree in cold weather. (credit: Jamie Squire/Getty Images)

‘Polar Vortex’ To Blast Frigid Air Over Much Of U.S.

Winter is normally cold, but tundra-like temperatures are soon poised to deliver a rare and potentially dangerous sledgehammer blow to much of the Midwest, driving temperatures so far below zero that records will shatter.

01/03/2014

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