CHICAGO'S DEEPEST FREEZE COLDEST IN LIFETIME! MIDWEST FEELS LIKE -75°

Pplar Vortex Triggering Coldest Arctic Outbreak in at Least Two Decades This Week in Parts of the Midwest

Extreme arctic cold has arrived in the Midwest, creating dangerously cold wind chills and likely dropping temperatures in some cities to their lowest levels in more than two decades. One instigator for this outbreak of cold air is a displacement of a lobe of the polar vortex to a position over the Great Lakes, according to a wunderground.com blog entry from Jeff Masters and Bob Henson.Chicago's O'Hare Airport dipped to minus 23 degrees Wednesday morning, their coldest temperature in 34 years, when their all-time record low of minus 27 degrees was set. Source