"Life-Threatening" Cold To Head East After Hitting Midwest

National Weather Service warns of "wind chill values as low as 60 degrees below zero"

(Reuters) - As the Midwestern United States shivered through the region's lowest temperatures in two decades and forecasters warned that life-threatening cold was heading eastward, officials in Chicago and other districts said schools would be closed on Monday.

Icy conditions snarled travel across the Midwest and thousands of flights were canceled or delayed, days after the Northeast was hammered by the first winter storm of the season.