As polar vortex tightens its grip on midwestern US - AccuWeather.com

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

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