The so-called "polar vortex" of dense, frigid air that dropped temperatures in some parts of the country to record lows is now spreading to southern and eastern parts of the U.S., shattering more temperature records, forcing flights to be canceled and keeping many schools and businesses shuttered.
https://www.youtube.com/watch?v=oCYx8_VwQtQ
https://www.youtube.com/watch?v=oCYx8_VwQtQ
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