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. The 10 coldest temperatures recorded in Chicago  Chicago Tribune
5. The polar vortex, explained  USA TODAY
6. View full coverage on Google News

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