Polar vortex 2019: Temperatures to plunge to 'historic' lows not seen in decades - AOL

1. Polar vortex 2019: Temperatures to plunge to 'historic' lows not seen in decades  AOL
2. What's a polar vortex? What's the lowest temperature ever recorded in the U.S.?  AL.com
3. Polar vortex: -46C temperatures turn Chicago River to ice  Guardian News
4. Temperatures Plunge to Lowest Levels in Decades as Polar Vortex Hits Midwest  The Wall Street Journal
5. How the polar vortex gets unleashed  9News.com KUSA
6. View full coverage on Google News

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