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A polar vortex is set to grip much of the U.S. What does that mean?
Bundle up and prepare: People living "basically anywhere from the Rockies eastward" will see extremely cold temperatures over the next several days, a meteorologist says.
Bundle up and prepare: People living "basically anywhere from the Rockies eastward" will see extremely cold temperatures over the next several days, a meteorologist says.
(Image credit: Nam Y. Huh)
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