- Polar vortex: -46C temperatures turn Chicago River to iceGuardian News
- 77 below zero? Polar vortex yields deadly cold as thousands endure power cuts, travel issues mount in MidwestAccuWeather.com
- Polar Vortex Live Updates: Extreme Cold Weather Hits MidwestThe New York Times
- Chicago weather: Polar vortex brings extreme cold and subzero windchillCurbed Chicago
- How dangerous (and historic) is the Polar Vortex hitting the Midwest? | TheHillThe Hill
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