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This combination of two satellite images provided by GeoEye and MJ Harden shows, left, an area of Joplin, Mo. which includes a view of the Joplin High School, taken in August of 2009 and, right, the same area of Joplin is shown, including the high school, taken Tuesday May 24, 2011, two days after a devastating tornado tore through the city.
AP Photo/Charlie Riedel
Bruce Hawkins takes a break from clean up at his moderately damaged home in a heavily devastated Joplin neighborhood, May 25, 2011.
AP Photo
A destroyed neighborhood 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.
AP Photo/The Joplin Globe, Roger Nomer
Kelsee Shanks, left, of Carl Junction, Mo., hugs Theresa Adams, of Joplin, Mo. in front of the wreckage of a school in Joplin on Tuesday, May 24, 2011. Shanks has children that attend the school, and Adams is a preschool aid at St. Mary's.
AP Photo/Charlie Riedel
A sign is seen in a devastated neighborhood in Joplin, Mo., May 25, 2011. An EF-5 tornado tore through much of the city on May 22, 2011, damaging a hospital and hundreds of homes and businesses.
Getty Images/Joe Raedle
Beverly Winans looks for the diamond rings that her mother gave her after her home was destroyed when a massive tornado passed through the town on May 24, 2011 in Joplin, Mo.
Getty Images/Mario Tama
A street sign sits on the ground on May 25, 2011 in Joplin, Mo. Authorities were prepared to find more bodies in the town of 50,000 people where around 8,000 structures were damaged or destroyed.
Getty Images/Mario Tama
Armored car courier Josh Beck works on salvaging cash from an ATM which was damaged and tossed approximately 20 feet when a massive tornado passed through the town on May 24, 2011 in Joplin, Mo.
Getty Images/Mario Tama
Zane Sexton pauses with his girlfriend Buffie Wescoat while salvaging items after Sexton's home was destroyed when a massive tornado passed through the town killing at least 116 people May 24, 2011 in Joplin, Mo.
AP Photo/Tulsa World, Adam Wisneski
A residential neighborhood in Joplin, Mo., is seen Monday, May 23, 2011 after it was leveled by a tornado that destroyed nearly 30 percent of the town on Sunday afternoon.
AP Photo/Mike Gullett
Displaced cattle walk through debris in eastern 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/Jeff Roberson
Kenneth Thomas searches through toys kept at his house for his grand children in what used to be his living room Wednesday, May 25, 2011, in Joplin, Mo. Thomas' house and much of Joplin was destroyed after a massive tornado hit the area Sunday night.
Getty Images/Mario Tama/Staff
People try to salvage items from the Albrecht family home after it was destroyed when a massive tornado passed through the town, May 24, 2011 in Joplin, Mo.
Getty Images/Mario Tama
Christal Comstock sits outside her family home which was destroyed when a massive tornado in Joplin, Mo. on Tuesday, May 24, 2011.
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Residents hug outside a home destroyed in Joplin, Mo. on Tuesday, May 24, 2011. The tornado that ripped through the town of about 50,000 people May 22, is being called the deadliest single tornado in the U.S. in 60 years.
AP Photo
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/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.
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A doll lies covered in debris in a home after it was destroyed when a massive tornado passed through the town in Joplin, Mo., May 24, 2011.
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Pete Anastosopolos (L) and Cyndi Devore sort through what is left of her home that was destroyed after a massive tornado passed through the town killing at least 116 people on May 24, 2011 in Joplin, Mo.
AP Photo/Charlie Riedel
The path of a powerful tornado 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.
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Devin Menapace is hugged by Donna Harmon as he is overcome with emotion while salvaging what he could from his mothers house on May 24, 2011 in Joplin, Mo.
AP Photo
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 cross stands atop a church that was severely damaged by a tornado in Joplin, Mo., as a severe storm passes overhead Monday, May 23, 2011.
AP Photo
The path of a powerful tornado 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.
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Janet Martin attempts to salvage medication and mementos from her brother's home before a second storm moves in, on May 23, 2011 in Joplin, Missouri. 'Twenty minutes before the storm, he left to go to church. He would have been in that basement if he hadn't gone,' Martin said.
AP Photo/Jeff Roberson
Josh Ramsey looks through the rubble of what is left of his mother-in-law's home following a tornado Monday, May 23 in Joplin , Mo.
AP Photo/Tulsa World, Adam Wisneski
A home in a neighborhood in Joplin, Mo., is seen Monday, May 23, 2011, after it was leveled by a tornado that caused heavy damage in the town on Sunday afternoon.
AP Photo/Charlie Riedel
A rescue worker walks past debris at Joplin High School, which was severely damaged by a tornado in Joplin, Mo., Monday, May 23, 2011.
AP Photo
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.
AP Photo/Mike Gullett
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.
AP Photo/Tulsa World, Adam Wisneski
A hand-written note to rescue workers is seen on a house that was damaged by a tornado that destroyed nearly 30 percent of Joplin, Mo., on Sunday afternoon. The twister cut a six-mile path through the city.
Getty Images/Joe Raedle
The ruins of a home are seen two days after a massive tornado passed through Joplin, Mo., on May 23, 2011. Rescue workers are searching for survivors as the threat of further storms still looms.
Getty Images/Mario Tama
Kimmy Lankford carries her son Jack, 5, during a walk through their neighborhood on May 25, 2011 in Joplin, Mo. The Lankfords continue to reside in their home a few blocks away which was damaged but remains habitable.
AP Photo/Jeff Roberson
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.
AP Photo/Jeff Roberson
Chad Efird tosses debris out of a house as he assists with cleanup 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.
Getty Images/Joe Raedle
A damaged home is seen surrounded by debris from other houses after a massive tornado struck Joplin, Mo. At least 116 people where killed in the storm and authorities were prepared to find more bodies in the town of 50,000.
AP Photo/Jeff Roberson
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, killing 116 people and damaging hundreds of homes and businesses.
AP Photo/Mark Schiefelbein
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.
Getty Images/Julie Denesha
Chad Lunt of the Kansas City Fire Department Rescue Team travels house to house looking for survivors on May 23, 2011 in Joplin, Mo.
AP Photo/Jeff Roberson
A man carries a box out of a house damaged by a tornado Monday, May 23 in Joplin , Mo. A massive tornado that tore a six-mile path across southwestern Missouri, ripping into a hospital, crushing cars like soda cans and leaving behind only splintered tree trunks where entire neighborhoods once stood.
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.
AP Photo/Tulsa World, Adam Wisneski
Rescue workers in lime-green jackets search for bodies and survivors inside St. John's hospital in Joplin, Mo., Monday, May 23, 2011.
AP Photo/Tulsa World, Adam Wisneski
The wall of a home in Joplin, Mo. is seen Monday, May 23, 2011, after it was damaged by a tornado that destroyed nearly 30 percent of the town on Sunday afternoon. The Joplin twister was one of 68 reported tornadoes across seven Midwest states over the weekend, stretching from Oklahoma to Wisconsin, according to the National Weather Service's Storm Prediction Center.
AP Photo/Mark Schiefelbein
Fire chief Mike McLeod, left, and firefighter Kyle Newport of the Arma, Kan., fire department look through the wreckage of a business in Joplin, Mo., Monday, May 23, 2011.
AP Photo/Charlie Riedel
Residents salvage items from their home which was severely damaged by a tornado in Joplin, Mo., as a severe storm passes overhead Monday, May 23, 2011.
AP Photo/Tulsa World, Adam Wisneski
Jean Logan reacts as she sees the damage to her home in Joplin, Mo., Monday, May 23. Logan and her granddaughter rode out the storm in the laundry room.
AP Photo/Mark Schiefelbein
A man walks past destroyed vehicles in the parking lot of the Joplin Regional Medical Center in Joplin, Mo., Sunday, May 22, 2011.
AP Photo/Mike Gullett
Residents of Joplin, Mo., survey the damage after a tornado hit the city on Sunday, May 22, 2011. The tornado tore a path a mile wide and four miles long destroying homes and businesses.
AP Photo/Roger Nomer/The Joplin Globe
Emergency personnel assess the damage of the remains of the Academy Sports building at 17th St. and Range Line Road in Joplin, Mo. following the tornado that struck the city on Sunday evening, May 22, 2011.
AP Photo/Mike Gullett
Residents begin digging through the rubble of their home after it was destroyed by a tornado that hit Joplin, Mo. on Sunday evening, May 22, 2011.
AP Photo/The Joplin Globe/ Roger Nomer
Emergency vehicles line up along northbound Rangeline Road in Joplin, Mo. after a tornado swept through the city in Joplin, Mo. on Sunday evening, May 22, 2011.
AP Photo/Mark Schiefelbein
Volunteer firefighters William Jackson, left, and Ashley Martin, center, from Oklahoma, and Johnny Ward of Joplin look through the wreckage of a home where it was feared a pregnant woman as feared to be trapped following a tornado in Joplin, Mo., Sunday, May 22, 2011. The three did not find anyone during their search.
AP Photo/Mark Schiefelbein
Emergency personnel walk through a neighborhood severely damaged by a tornado near the Joplin Regional Medical Center in Joplin, Mo., Sunday, May 22, 2011.
AP Photo/The Joplin Globe, Roger Nomer
An emergency worker carries a girl to safety from the remains of Academy Sports in Joplin, Mo. after a tornado struck the city on Sunday evening, May 22, 2011.
AP Photo/The Wichita Eagle, Jaime Green
A tractor trailer is tipped over on Interstate 44 near Joplin, Mo., after the town was hit by a tornado on Sunday, May 22, 2011.
