Joplin Tornado

A torn and muddied American flag flies as employees of a boiler company search through the wreckage of their office on the east side of Joplin, Mo., Tuesday, May 24, 2011. At least 116 people were killed and hundreds more injured when a tornado cut a destructive path through Joplin on Sunday evening. The workers said the flag was not theirs, but that they had found it in the building's debris, apparently carried there from somewhere else. (AP Photo/Mark Schiefelbein)

The path of a powerful tornado is seen in an aerial photo over Joplin, Mo., Tuesday, May 24, 2011. A tornado moved through much of the city Sunday, damaging a hospital and hundreds of homes and businesses and killing at least 116 people. (AP Photo/Charlie Riedel)

An undamaged crucifix rises above the rubble of St. Mary's Catholic Church in Joplin, Mo., Monday, May 23, 2011. The church and thousands of other buildings were damaged or destroyed when a tornado swept through Joplin on Sunday evening, killing at least 116 and injuring hundreds more. (AP Photo/Mark Schiefelbein)

This frame grab from video shows a massive tornado on Sunday, May 22, 2011, outside Joplin, Mo. The tornado tore a 6-mile path across southwestern Missouri killing at least 89 people as it slammed into the city of Joplin, ripping into a hospital, crushing cars like soda cans and leaving a forest of splintered tree trunks behind where entire neighborhoods once stood. (AP Photo/tornadovideo.net)

Linda Dinwiddie stands outside a tornado-damaged house belonging to her nephew Tuesday, May 24, 2011, in Joplin , Mo. A large tornado moved through much of the city Sunday, damaging a hospital and hundreds of homes and businesses. (AP Photo/Jeff Roberson)

On this Sunday, May 22, 2011 photo, two young Joplin, Mo, residents carry their dog and head to a rescue center after their home was destroyed by a tornado that hit the southwest Missouri city on Sunday evening. The tornado tore a path a mile wide and four miles long destroying homes and businesses.(AP Photo/Mike Gullett)

Workers are lifted into place with a crane to start disassembling a collapsed cell phone tower in Joplin, Mo., Tuesday, May 24, 2011. At least 116 people were killed and hundreds more injured when a tornado cut a destructive path through Joplin on Sunday evening. (AP Photo/Mark Schiefelbein)

This aerial photograph shows a neighborhood destroyed by a powerful tornado in Joplin, Mo. Tuesday, May 24, 2011. A tornado moved through much of the city Sunday, damaging a hospital and hundreds of homes and businesses and killing at least 116 people. (AP Photo/Charlie Riedel)

Emergency personnel dig through the rubble of a home near the St. John's Regional Medical Center in Joplin, Mo., Monday, May 23, 2011. A destructive tornado moved through the city on Sunday evening, killing at least 89 people and injuring hundreds more. (AP Photo/Mark Schiefelbein)

A destroyed apartment complex is seen in an aerial view over Joplin, Mo. Tuesday, May 24, 2011. A tornado moved through much of the city Sunday, damaging a hospital and hundreds of homes and businesses and killing at least 116 people. (AP Photo/Charlie Riedel)

Beth Lansaw wipes away tears as she stands in the backyard of her son's home Tuesday, May 24, 2011, in Joplin , Mo. Lansaw's son, Don Lansaw, was killed when a tornado hit his home Sunday night. (AP Photo/Jeff Roberson)

Laura Vanzant looks for her dog Monday, May 23, 2011, at her home that was destroyed by a tornado in Joplin, Mo. A large tornado moved through much of the city Sunday, damaging a hospital and hundreds of homes and businesses and killing at least 89 people. (AP Photo/Charlie Riedel)

Many signs and paintings on the outside of destroyed or damaged homes informed rescuers that everyone was safe and accounted for in Joplin, Mo, on Monday, May 23, 2011. This home was one of hundreds that were damaged or destroyed by a tornado that struck Joplin, Mo, on Sunday, May 22. (AP Photo/Mike Gullett)