Polar vortex, temperatures

The plunging polar vortex brought subfreezing temperatures Tuesday ... according to electric utility tracking website ...
That system is expected to push northeastward by Friday with a mix of heavy snow and freezing rain forecast from southeastern Oklahoma and northeastern Texas all the way to the Virginia and North ...
AP) — A huge swath of the U.S. was blasted with ice, snow and wind on Monday as the polar vortex that dipped south ... with districts in Indiana, Virginia, Kentucky, Missouri and Kansas ...
Imagine the polar vortex as a giant, icy whirlpool far above the Earth, keeping frigid Arctic air contained near the north ...