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Lightning strikes the Willis Tower in Chicago

Lightning strikes the Willis Tower, formerly Sears Tower, in downtown Chicago on June 12, 2013. A massive storm system with heavy rain, high winds, hail and possible tornadoes moved into Illinois and much of the central part of the Midwest on Wednesday.
Lightning strikes the Willis Tower, formerly Sears Tower, in downtown Chicago on June 12, 2013. A massive storm system with heavy rain, high winds, hail and possible tornadoes moved into Illinois and much of the central part of the Midwest on Wednesday.Scott Olson / Getty Images

NBC News reports

Tornado watches and warnings stretched over the Midwest on Wednesday night as a massive storm system menaced the biggest cities of the Midwest, pushing tornadoes, extraordinary winds and heavy rain — and perhaps even a derecho, an explosive wind pattern that's like a hurricane on land.

In the Chicago area, a tornado was confirmed on the ground late Wednesday afternoon in Somonauk, about 50 miles southwest of the city, and was heading northeast, NBC Chicago reported. Flights into O'Hare International Airport were delayed an average of 88 minutes, the Federal Aviation Administration said, and all suburban commuter trains were halted or delayed.