An Extreme Cold Warning has been issued for Chicago as the city braces for dangerously low temperatures. Meteorologist Laura Bannon reports that the severe conditions have led to school closures and flight delays at O'Hare Airport. Subzero temperatures are expected to persist, creating hazardous conditions for residents. The cold front is part of a larger winter storm system affecting the Great Lakes region. Residents are urged to take precautions against frostbite and hypothermia.