Joplin tornado

Residents of Joplin, Mo, walk west on 26th Street near Maiden Lane after a tornado hit the southwest Missouri city on Sunday evening, May 22, 2011. The tornado tore a path a mile wide and four miles long destroying homes and businesses. (AP Photo/Mike Gullett)

A destroyed shopping center is seen 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)

A woman carries belongings through the wreckage of an apartment complex 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)

A destroyed neighborhood is seen in Joplin, Mo. Tuesday, May 24, 2011. A large tornado moved through much of the city Sunday, damaging a hospital and hundreds of homes and businesses. (AP Photo/Charlie Riedel)

A commercial neighborhood in Joplin, Mo., is seen Monday, May 23, 2011, after it was leveled by a tornado that caused heavy damage on Sunday afternoon. The twister cut a six-mile path through the city. (AP Photo/Tulsa World, Adam Wisneski)

Meghan Miller stands in the middle of a destroyed neighborhood as she checks on her sister-in-law's home Monday, May 23, 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)

A man carries a young girl who was rescued after being trapped with her mother in their home after a tornado hit Joplin, Mo. on Sunday evening, May 22, 2011. The tornado tore a path a mile wide and four miles long destroying homes and businesses. (AP Photo/Mike Gullett)

A destroyed Home Depot is seen in Joplin, Mo. Tuesday, May 24, 2011. A large tornado moved through much of the city Sunday, damaging a hospital and hundreds of homes and businesses. AP Photo/Charlie Riedel)

A destroyed apartment complex is seen in Joplin, Mo. Tuesday, May 24, 2011. A large tornado moved through much of the city Sunday, damaging a hospital and hundreds of homes and businesses. (AP Photo/Charlie Riedel)

A destroyed neighborhood is seen in Joplin, Mo. Tuesday, May 24, 2011. A large tornado moved through much of the city Sunday, damaging a hospital and hundreds of homes and businesses. (AP Photo/Charlie Riedel)

Damaged Joplin High School is seen among a destroyed neighborhood 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)

A destroyed neighborhood is seen in Joplin, Mo. Tuesday, May 24, 2011. A large tornado moved through much of the city Sunday, damaging a hospital and hundreds of homes and businesses. (AP Photo/Charlie Riedel)

Oklahoma Task Force One search-and-rescue members, from left, Jim Winham, Nick Swainston and Kevin Mann search through debris for victims on 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)

Emergency personnel walk through a neighborhood severely damaged by a tornado near the Joplin Regional Medical Center in Joplin, Mo., Sunday, May 22, 2011. A large tornado moved through much of the city, damaging a hospital and hundreds of homes and businesses. (AP Photo/Mark Schiefelbein)

Deputy Eddy Mathews of the Mayes County, Okla., Sheriff's Department hands off a dog to volunteer Mike Hughey of Ozark, Mo., after rescuers found a pair of dogs in the rubble of a destroyed 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 police officer pushes a cart loaded with supplies to a command post behind a destroyed Wal-Mart store 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)

Search-and-rescue volunteers walk through the wreckage of a destroyed neighborhood 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)

Ashley Stephens holds a ferret she rescued from the home of a missing woman while helping a friend collect belongings Monday, May 23, 2011, 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)

Ronnie Wilson pulls items from the trunk of his damaged car at an apartment complex 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. Wilson and his fiancee survived the tornado in the apartment at rear of the photo by huddling in the unit's bathroom. (AP Photo/Mark Schiefelbein)

Mark Siler carries some salvageable items from the house of his friend Clay Warden as another storm approaches Joplin, Mo. on Monday, May 23, 2011. Warden's house was destroyed on Sunday by a tornado that hit the southwest Missouri town. (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)

Coworkers Cindy Albers, left, and Kim Hoosier hug on 20th Street near New Hampshire Ave in Joplin, MO., Monday, May 23, 2011. A large 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/ The News Leader, Valerie Mosley)

Police officers walk in to the back of a destroyed Wal-Mart store 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 frame grab from video shows lightning inside 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)

Kathleen Kelsey, a canine rescue specialist with the Missouri Task Force One search-and-rescue team, guides a live-find dog named ChicoDog through the wreckage of a public housing complex in Joplin, Mo., Monday, May 23, 2011. A destructive tornado swept through Joplin on Sunday evening, killing at least 116 and injuring hundreds more. (AP Photo/Mark Schiefelbein)

A destroyed helicopter lies on its side in the parking lot of the Joplin Regional Medical Center in Joplin, Mo., Sunday, May 22, 2011. A large tornado moved through much of the city, damaging the hospital and hundreds of homes and businesses. (AP Photo/Mark Schiefelbein)

Gary Terry, left, and James Ruddick look through the debris of the auto repair shop they work at 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)

Maggie Kelley and her husband, Trey Adams hug their dog, Saint, after finding him amid the rubble of her home in Joplin, Mo. Monday, May 23, 2011. The two are Hurricane Katrina evacuees. Joplin was leveled by a tornado that destroyed nearly 30 percent of the town on Sunday afternoon. The twister cut a six-mile path through the city. (AP Photo/Tulsa World, Adam Wisneski)

Members of Missouri Task Force One search-and-rescue team work at a tornado-damaged Home Depot store 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)

A woman makes her way into the damaged main entrance of Joplin High School 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. Classes at all Joplin schools have been canceled for the rest of the schoolyear after four schools were damaged or destroyed. (AP Photo/Mark Schiefelbein)

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)