Polar vortex starts to withdraw after leaving 21 dead | CBC News
As Polar Vortex Stirs, Deep Freeze Threatens U.S. and Europe - Bloomberg
The Polar Vortex is back and here to stay | AccuWeather
Residents across Midwest capture effects of polar vortex
Polar vortex: -46C temperatures as Chicago River turns to ice - YouTube
Brrr! Museums Across the Midwest Shutter as the Polar Vortex Drives Temperatures as Low as -51 Degrees
The polar vortex is coming—and raising the odds for intense winter weather
Polar vortex brings Chicago to a standstill: 'It's our own natural disaster'
In pictures: Polar vortex strikes North America - BBC News
A Merciless Cold Lingers in the Midwest - The New York Times
Polar vortex: Frost quakes and transport chaos grips major US cities | news.com.au — Australia's leading news site
Chicago Weather: Polar vortex brings brutal cold, Wind Chill Warning in effect - ABC7 Chicago
Arctic Chicago - Polar Vortex - drone footage - YouTube
Here Are the Wildest Photos of the Polar Vortex Rocking Chicago
The "Polar Vortex" of 2014
Polar vortex to attack US next week with 'life-threatening, brutal' cold
Polar Vortex 2014: Photos of a Chicago Deep Freeze — Colossal
Polar Vortex Causes Midwest States Of Emergency As Cold Pushes Farther South : NPR
Polar vortex set to plunge parts of US into deep freeze | AccuWeather
Is This a 'Polar Vortex' in Chicago? | Snopes.com
What is the 'polar vortex'?
Chiberia': extreme cold in Chicago inspires solidarity and awe | Chicago | The Guardian
