- As polar vortex tightens its grip on midwestern US AccuWeather.com
- Millions gearing up for polar vortex, as temperatures plunge to lows not seen in a generation NBCNews.com
- Deadly polar vortex sweeping Midwest with wind chills as low as minus 65 CBS This Morning
- LIVE TEMPERATURES: Chicago Weather: Polar vortex brings brutal cold, Wind Chill Warning in effect WLS-TV
- The polar vortex, explained USA TODAY
- View full coverage on Google News
from Top stories - Google News http://bit.ly/2DI81Vt
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