illinois

Visitors walk through the holiday lights display "ZooLights" at the Lincoln Park Zoo in Chicago, Illinois...Visitors walk through the holiday lights display "ZooLights" at the Lincoln Park Zoo in Chicago, Illinois

Jim Young/Reuters

Visitors walk through the holiday lights display “ZooLights” at the Lincoln Park Zoo in Chicago, Illinois.

A vehicle sits on a pile of debris from the destruction caused by a tornado that touched down in Washington, Illinois, November 17, 2013. A fast-moving storm system triggered multiple tornadoes on Sunday, killing at least five people, injuring about 40 and flattening large parts of the city of Washington, Illinois as it tore across the Midwest, officials said.

Jim Young/Reuters

A vehicle sits on a pile of debris, the result of one of a series of tornados that tore across the American Midwest on Sunday, killing at least five people, injuring about 40 and flattening large parts of the city of Washington, Illinois

Lightning strikes the Willis Tower (formerly Sears Tower) in downtown in Chicago, Illinois. A massive storm system with heavy rain, high winds, hail and possible tornadoes is expected to move into Illinois and much of the central part of the Midwest today.

Scott Olson/Getty Images

Lightning strikes the Willis Tower (formerly Sears Tower) on early Thursday morning in Chicago, Illinois. A massive storm system with heavy rain, high winds, hail and possible tornadoes is expected to move into Illinois and much of the central part of the Midwest.