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Deep Freeze Sets In
By Tracie Potts
(NBC News) There's a blanket of cold air over the entire nation this morning.
Meteorologist call it a "polar vortex", but most people just call it brutally cold.
Minnesota has some of the coldest temperatures in the nation.
The polar vortex dipped into the Deep South as well, causing power outages in Dallas and snow in Georgia.
Flightaware reports almost 2,000 cancellations already today and more are expected.