Meteorologists: Cold Weather Over Much Of US Isn't Because Of Polar VortexHeavy snow blanketed parts of the Upper Midwest with more than a foot of snow on Tuesday, leaving residents there and in the Rockies waking up to frigid temperatures that plunged as much as 50 degrees overnight.
Temperatures Plunge 50 Degrees Overnight In Some Parts Of USResidents across the Rockies and Upper Midwest dug out from under a foot or more of snow on Tuesday, after waking up to frigid temperatures that plunged as much as 50 degrees overnight.
Cold Snap Knocks Texas Electric Generators OfflineJanuary's polar vortex knocked several important coal-fired electricity plants offline, and the Sierra Club says the loss of power shows the need for more wind turbines and energy conservation programs.

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