What's a polar vortex? What's the lowest temperature ever recorded in the U.S.? - AL.com

1. What's a polar vortex? What's the lowest temperature ever recorded in the U.S.?  AL.com
2. Polar vortex 2019: Temperatures to plunge to 'historic' lows not seen in decades  AOL
3. Polar vortex: -46C temperatures turn Chicago River to ice  Guardian News
4. Polar vortex linked to 8 deaths as dangerous cold slams the Midwest  Fox News
5. Road chaos in US Midwest as biting polar vortex brings -50C | ITV News  ITV News
6. View full coverage on Google News

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