'Polar Vortex' Will Make Chicago
Colder Than Antarctica Weather stations say it will fall down
to -20º on Wednesday in the Windy City. Over 750 flights out of Chicago have been canceled for that day due to the expected deep freeze. It will also be warmer at the
top of Mount Everest. Across the Midwest, it is expected to plunge down to -40º in some areas. Overall, the 'Polar Vortex' will leave 80 million Americans in sub-zero temperatures this week.