77 below zero? Polar vortex yields deadly cold as thousands endure power cuts, travel issues mount in Midwest - AccuWeather.com

77 below zero? Polar vortex yields deadly cold as thousands endure power cuts, travel issues mount in Midwest  AccuWeather.comThe Midwest is colder than Antarctica thanks to the polar vortex — here's what it looks like  Business InsiderPolar vortex: -46C temperatures turn Chicago River to ice  Guardian NewsChicago Weather Forecast Calls For More Snow Thursday Before Temperatures Rise  CBS ChicagoHow dangerous (and historic) is the Polar Vortex hittin