- Polar vortex: -46C temperatures turn Chicago River to ice – video reportThe Guardian
- 77 below zero? Polar vortex yields deadly cold as thousands endure power cuts, travel issues mount in MidwestAccuWeather.com
- Polar vortex 2019: Temperatures to plunge to ‘historic’ lows not seen in decadesAOL
- LIVE TEMPERATURES: Chicago Weather: Polar vortex brings record cold, Wind Chill Warning in effectWLS-TV
- How dangerous (and historic) is the Polar Vortex hitting the Midwest? | TheHillThe Hill
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