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Lea Bessinger salvages a picture of Jesus as she and her son Josh Bessinger sort through the rubble of the elder Bessinger's tornado-ravaged home Tuesday, May 21, 2013, in Moore, Okla. A huge tornado roared through the Oklahoma City suburb Monday, flattening an entire neighborhoods and destroying an elementary school with a direct blow as children and teachers huddled against winds. (AP Photo/Charlie Riedel) ( Oklahoma Tornado )

AT&T employees sort through tangled phone lines as they clean up in a tornado-ravaged neighborhood Tuesday, May 21, 2013, in Moore, Okla. A huge tornado roared through the Oklahoma City suburb Monday, flattening entire neighborhoods and destroying an elementary school with a direct blow as children and teachers huddled against winds. (AP Photo/Charlie Riedel) ( Oklahoma Tornado )

Zac Woodcock salvages items from the rubble of a tornado-ravaged rental home which they own Tuesday, May 21, 2013, in Moore, Okla. A huge tornado roared through the Oklahoma City suburb Monday, flattening an entire neighborhoods and destroying an elementary school with a direct blow as children and teachers huddled against winds. (AP Photo/Charlie Riedel) ( Oklahoma Tornado )

In this handout provided by the U.S. Department of Defense, U.S. Soldiers and Airmen with the Oklahoma Army National Guard and the Oklahoma Air National Guard along with firefighters participate in recovery efforts after a tornado moved through on May 20, 2013 in Moore, Oklahoma. The town reported a tornado to be at least EF4 strength and two miles wide that touched down Monday killing at least 24 people and leveling everything in its path. U.S. President Barack Obama promised federal aid to supplement state and local recovery efforts. (Photo by Sgt. 1st Class Kendall James/U.S. Department of Defense via Getty Images) ( 169186994 )

In this handout provided by the U.S. Department of Defense, two firefighters break through concrete during the search for survivors in the remains of the Plaza Towers Elementary School after it was hit by a tornado on May 20, 2013 in Moore, Oklahoma. The town reported a tornado to be at least EF4 strength and two miles wide that touched down Monday killing at least 24 people and leveling everything in its path. U.S. President Barack Obama promised federal aid to supplement state and local recovery efforts. (Photo by Maj. Geoff Legler, Oklahoma National Guard Public Affairs/U.S. Department of Defense via Getty Images) ( 169186769 )

Piles of debris lie around a home destroyed by a tornado May 21, 2013 in Moore, Oklahoma. The town reported a tornado of at least EF4 strength and two miles wide that touched down yesterday killing at least 24 people and leveling everything in its path. U.S. President Barack Obama promised federal aid to supplement state and local recovery efforts. (Photo by Brett Deering/Getty Images) ( 169184727 )

A concrete angel rests on a destropyed car in a tornado-ravaged neighborhood Tuesday, May 21, 2013, in Moore, Okla. A huge tornado roared through the Oklahoma City suburb Monday, flattening entire neighborhoods and destroying an elementary school with a direct blow as children and teachers huddled against winds. (AP Photo/Charlie Riedel) ( Oklahoma Tornado )

A local resident allowed looks through the rubble of a destroyed home, one day after a tornado moved through Moore, Okla., Tuesday, May 21, 2013. Emergency crews searched the broken remnants of an Oklahoma City suburb Tuesday for survivors of a massive tornado that flattened homes and demolished an elementary school. (AP Photo/Brennan Linsley) ( Oklahoma Tornado )

Debris lies around Moore Cemetery after it was damaged by a tornado May 21, 2013 in Moore, Oklahoma. The town reported a tornado of at least EF4 strength and two miles wide that touched down yesterday killing at least 24 people and leveling everything in its path. U.S. President Barack Obama promised federal aid to supplement state and local recovery efforts. (Photo by Brett Deering/Getty Images) ( 169184833 )

Piles of debris and cars lie around a home destroyed by a tornado May 21, 2013 in Moore, Oklahoma. The town reported a tornado of at least EF4 strength and two miles wide that touched down yesterday killing at least 24 people and leveling everything in its path. U.S. President Barack Obama promised federal aid to supplement state and local recovery efforts. (Photo by Brett Deering/Getty Images) ( 169184530 )

Headstones lie overturned in the Moore Cemetery after it was damaged by a tornado May 21, 2013 in Moore, Oklahoma. The town reported a tornado of at least EF4 strength and two miles wide that touched down yesterday killing at least 24 people and leveling everything in its path. U.S. President Barack Obama promised federal aid to supplement state and local recovery efforts. (Photo by Brett Deering/Getty Images) ( 169184531 )

Piles of debris lie around the northeast corner of Plaza Towers Elementary school after it was damaged by a tornado May 21, 2013 in Moore, Oklahoma. The town reported a tornado of at least EF4 strength and two miles wide that touched down yesterday killing at least 24 people and leveling everything in its path. U.S. President Barack Obama promised federal aid to supplement state and local recovery efforts. (Photo by Brett Deering/Getty Images) ( 169181794 )

Cars lie around the northeast corner of Plaza Towers Elementary school after it was damaged by a tornado May 21, 2013 in Moore, Oklahoma. The town reported a tornado of at least EF4 strength and two miles wide that touched down yesterday killing at least 24 people and leveling everything in its path. U.S. President Barack Obama promised federal aid to supplement state and local recovery efforts. (Photo by Brett Deering/Getty Images) ( 169181791 )

A couple after a tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams) ( Severe Weather )

A truck lays damaged in a field near the Moore Medical Center, background, after a tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams) ( Severe Weather )

Emergency workers pull out a woman that was trapped in a building that was destroyed off of 4th Street and Interstate 35 after a tornado ripped through Moore, Okla., Monday May 20, 2013. (AP Photo/ The Transcript,Kyle Phillips ) ( Severe Weather )

This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch) ( Severe Weather )

People salvage belongings after a huge tornado struck Moore, Oklahoma May 20, 2013. A 2-mile-wide (3-km-wide) tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people while destroying entire tracts of homes, piling cars atop one another, and trapping two dozen school children beneath rubble. REUTERS/Gene Blevins ( USA-TORNADOES/ )

Two girls stand in rubble after a tornado struck Moore, Oklahoma, May 20, 2013. A 2-mile-wide (3-km-wide) tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people while destroying entire tracts of homes, piling cars atop one another, and trapping two dozen school children beneath rubble. REUTERS/Gene Blevins ( USA-TORNADOES/ )

People are seen next to a damaged house and vehicles along a street after a huge tornado, in Moore, Oklahoma May 20, 2013. A 2-mile-wide (3-km-wide) tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people while destroying entire tracts of homes, piling cars atop one another, and trapping two dozen school children beneath rubble. REUTERS/Gene Blevins ( USA-TORNADOES/ )

A damaged police car is seen after a tornado struck Moore, Oklahoma, May 20, 2013. A 2-mile-wide (3-km-wide) tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people while destroying entire tracts of homes, piling cars atop one another, and trapping two dozen school children beneath rubble. REUTERS/Gene Blevins ( USA-TORNADOES )

Abby Madi (L) and Peterson Zatterlee comforts Zaterlee's dog Rippy, after a tornado struck Moore, Oklahoma, May 20, 2013. A 2-mile-wide (3-km-wide) tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people while destroying entire tracts of homes, piling cars atop one another, and trapping two dozen school children beneath rubble. REUTERS/Gene Blevins ( USA-TORNADOES )

A damaged police car is seen after a tornado struck Moore, Oklahoma, May 20, 2013. A 2-mile-wide (3-km-wide) tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people while destroying entire tracts of homes, piling cars atop one another, and trapping two dozen school children beneath rubble. REUTERS/Gene Blevins ( USA-TORNADOES )

People look for belongings after a tornado struck Moore, Oklahoma, May 20, 2013. A 2-mile-wide (3-km-wide) tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people while destroying entire tracts of homes, piling cars atop one another, and trapping two dozen school children beneath rubble. REUTERS/Gene Blevins ( USA-TORNADOES )

An American flag lies on top of an overturned car after a tornado struck Moore, Oklahoma, May 20, 2013. A 2-mile-wide (3-km-wide) tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people while destroying entire tracts of homes, piling cars atop one another, and trapping two dozen school children beneath rubble. REUTERS/Gene Blevins ( USA-TORNADOES )

Damaged cars are seen in the parking lot of Moore Hospital after a tornado struck Moore, Oklahoma, May 20, 2013. A huge tornado with winds of up to 200 miles per hour (320 kph) devastated the Oklahoma City suburb of Moore on Monday, ripping up at least two elementary schools and a hospital and leaving a wake of tangled wreckage. REUTERS/Gene Blevins ( USA-TORNADOS )

A fire official drives through the rubble of Moore Medical Center after a tornado struck Moore, Oklahoma, May 20, 2013. A 2-mile-wide (3-km-wide) tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people while destroying entire tracts of homes, piling cars atop one another, and trapping two dozen school children beneath rubble. REUTERS/Gene Blevins ( USA-TORNADOES/ )

This aerial photo shows damage to Plaza Towers Elementary School after it was hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch) ( Severe Weather )

Rescuers search through rubble after a tornado struck Moore, Oklahoma, May 20, 2013. A 2-mile-wide (3-km-wide) tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people while destroying entire tracts of homes, piling cars atop one another, and trapping two dozen school children beneath rubble. REUTERS/Gene Blevins ( USA-TORNADOES/ )

Two men go through the damage surrounding the Moore Medical Center and damaged vehicals after a tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams) ( Severe Weather )

A man stands among the wreckage after a tornado struck Moore, Oklahoma, May 20, 2013. A huge tornado with winds of up to 200 miles per hour (320 kph) devastated the Oklahoma City suburb of Moore on Monday, ripping up at least two elementary schools and a hospital and leaving a wake of tangled wreckage. REUTERS/Gene Blevins ( USA-TORNADOES/ )

Clark Gardner, at left, and another man place an American flag on debris in a neighborhood off of Telephone Road in Moore, Okla., after a tornado moved through the area on Monday, May 20, 2013. (AP Photo/ The Oklahoman, Bryan Terry) ( Severe Weather )

This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch) ( Severe Weather )

Two men stand in front of Plaza Towers Elementary School in Moore, Okla., after a tornado destroyed a the school on Monday, May 20, 2013. (AP Photo/ The Oklahoman, Bryan Terry) ( Severe Weather )

This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch) ( Severe Weather )

This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch) ( Severe Weather )

This aerial photo shows damage to Plaza Towers Elementary School after it was hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch) ( Severe Weather )

This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch) ( Severe Weather )

A demolished home with the car flipped over is all that remains left behind in the damage from the tornado that hit the area near 149th and Drexel on Monday, May 20, 2013 in Oklahoma City, Okla. (AP Photo/ The Oklahoman, Chris Landsberger) ( Severe Weather )

Searchers rest outside the Briarwood Elementary School after the tornado destroyed the school , Monday, May 20, 2013. (AP Photo/ The Oklahoman, David McDaniel) ( Severe Weather )

Workers continue to dig through the rubble of Plaza Towers Elementary School after a tornado moved through Moore, Okla., Monday, May 20, 2013. (AP Photo Sue Ogrocki) ( Severe Weather )

Kay Taylor stands with her dog Bailey in front of her house that was destroyed after the tornado that hit the area near 149th and Drexel on Monday, May 20, 2013 in Oklahoma City, Okla. (AP Photo/ The Oklahoman, Chris Landsberger) ( Severe Weather )

Kay James holds her cat as she sits in her driveway after her home was destroyed by the tornado that hit the area on Monday, May 20, 2013 in Oklahoma City, Okla. (AP Photo/The Oklahoman, Chris Landsberger) ( Severe Weather )

People survey the destructions at the Moore hospital after it was hit by a tornado that destroyed buildings and overturned cars in Moore, Oklahoma, May 20, 2013. A huge tornado with winds of up to 200 miles per hour (320 kph) devastated the Oklahoma City suburb of Moore on Monday, ripping up at least two elementary schools and a hospital and leaving a wake of tangled wreckage. REUTERS/Gene Blevins ( USA-TORNADOES/ )

A woman is tended to by a Emergency Medical Technician after a huge tornado struck Moore, Oklahoma, near Oklahoma City, May 20, 2013. A massive tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people as winds of up to 200 miles per hour (320 kph) flattened entire tracts of homes, two schools and a hospital, leaving a wake of tangled wreckage. REUTERS/Richard Rowe ( USA-TORNADOES/ )

Rescuers recover a horse from the remains of a day care center and destroyed barns, Monday, May 20, 2013 in Moore, Okla. A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/The Oklahoman, Steve Sisney) ( Severe Weather )

Oklahoma City fire fighters check on the status of Gene Tripp as he sits in his rocking chair where his home once stood after being destroyed by a tornado hit the area near 149th and Drexel on Monday, May 20, 2013 in Oklahoma City, Okla. (AP Photo/The Oklahoman, Chris Landsberger) ( Severe Weather )

A rescue worker looks for victims in the Moore Hospital parking lot after being hit by a tornado that destroyed buildings and overturned cars in Moore, Oklahoma, near Oklahoma City, May 20, 2013. A huge tornado with winds of up to 200 miles per hour (320 kph) devastated the Oklahoma City suburb of Moore on Monday, ripping up at least two elementary schools and a hospital and leaving a wake of tangled wreckage. At least four people were killed, KFOR television said, citing a reporter's eyewitness account, and hospitals said dozens of people were injured. REUTERS/Gene Blevins ( USA/MOOR-TORNADO-DAMAGE )

A nurse walks the destruction at Moore hospital after a huge tornado struck Moore, Oklahoma, near Oklahoma City, May 20, 2013. A huge tornado with winds of up to 200 miles per hour (320 kph) devastated the Oklahoma City suburb of Moore on Monday, ripping up at least two elementary schools and a hospital and leaving a wake of tangled wreckage. REUTERS/Gene Blevins ( USA-TORNADOES/ )

Downed power lines block a road after a huge tornado struck Moore, Oklahoma, near Oklahoma City, May 20, 2013. A massive tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people as winds of up to 200 miles per hour (320 kph) flattened entire tracts of homes, two schools and a hospital, leaving a wake of tangled wreckage. REUTERS/Richard Rowe ( USA-TORNADOES/ )

Destroyed automobiles and debris block the entrance to a commercial building after a huge tornado struck Moore, Oklahoma, near Oklahoma City, May 20, 2013. A massive tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people as winds of up to 200 miles per hour (320 kph) flattened entire tracts of homes, two schools and a hospital, leaving a wake of tangled wreckage. REUTERS/Richard Rowe ( USA-TORNADOES/ )

Rescue workers help free one of the 15 people that were trapped at a medical building at the Moore hospital complex after a tornado tore through the area of Moore, Oklahoma May 20, 2013. REUTERS/Gene Blevins ( USA-TORNADOES/ )

A car is crushed by a fallen building after a huge tornado struck Moore, Oklahoma, near Oklahoma City, May 20, 2013. A massive tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people as winds of up to 200 miles per hour (320 kph) flattened entire tracts of homes, two schools and a hospital, leaving a wake of tangled wreckage. REUTERS/Richard Rowe ( USA-TORNADOES/ )

A girl tries to keep warm near the Moore Hospital after being hit tornado that destroyed buildings and overturned cars in Moore, Oklahoma, May 20, 2013. A huge tornado with winds of up to 200 miles per hour (320 kph) devastated the Oklahoma City suburb of Moore on Monday, ripping up at least two elementary schools and a hospital and leaving a wake of tangled wreckage. REUTERS/Gene Blevins ( USA/MOOR-TORNADO-DAMAGE )

Rescue workers help free one of the 15 people that were trapped at a medical building at the Moore hospital complex after a tornado tore through the area of Moore, Oklahoma May 20, 2013. REUTERS/Gene Blevins ( USA-TORNADOES/ )

A man looks through the remains of a home after a huge tornado struck Moore, Oklahoma, near Oklahoma City, May 20, 2013. A massive tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people as winds of up to 200 miles per hour (320 kph) flattened entire tracts of homes, two schools and a hospital, leaving a wake of tangled wreckage. REUTERS/Richard Rowe ( USA-TORNADOES/ )

Rescues workers look for victims in the rubble of a destroyed building at the Moore Hospital in Moore, Oklahoma, May 20, 2013. A huge tornado with winds of up to 200 miles per hour (320 kph) devastated the Oklahoma City suburb of Moore on Monday, ripping up at least two elementary schools and a hospital and leaving a wake of tangled wreckage. REUTERS/Gene Blevins ( USA-TORNADOES/ )

Allen Anderson surveys the damage to his home, Monday, May 20, 2013 in Moore, Okla. A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/The Oklahoman, Steve Sisney) ( Severe Weather )

The Moore Medical Center and vehicles lay damaged after a tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams) ( Severe Weather )

Dozen of cars piled up on top of each other in the parking lot of Moore Hospital after a tornado struck Moore, Oklahoma, May 20, 2013. A huge tornado with winds of up to 200 miles per hour (320 kph) devastated the Oklahoma City suburb of Moore on Monday, ripping up at least two elementary schools and a hospital and leaving a wake of tangled wreckage. REUTERS/Gene Blevins ( USA-TORNADOES/ )

A tornado moves through Moore, Okla. as northbound traffic on Interstate 35 stops at Indian Hills Road on Monday, May 20, 2013. (AP Photo/Alonzo Adams) ( Severe Weather )

Glenn Rusk hugs his neighbor Sherie Loman outside her home north of Briarwood Elementary School after a tornado moved through the area, in Moore, Okla., Monday, May 20, 2013. (AP Photo/The Oklahoman, David McDaniel) ( Severe Weather )

JoAnn Anderson sorts through the rubble of her home after a tornado on Monday, May 20, 2013 in Moore, Okla. A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/The Oklahoman, Steve Sisney) ( Severe Weather )

Sydney Whittaker salvages items from Trends Salon on Monday, May 20, 2013 in Moore, Okla. A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/The Oklahoman, Steve Sisney) ( Severe Weather )

A teacher hugs a child at Briarwood Elementary school after a tornado destroyed the school in south Oklahoma City, Monday, May 20, 2013. A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/The Oklahoman, Paul Hellstern) ( Severe Weather )

Teachers carry children away from Briarwood Elementary school after a tornado destroyed the school in south Oklahoma City, Monday, May 20, 2013. A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/The Oklahoman, Paul Hellstern) ( Severe Weather )

Resident Kim Schwab looks over her destroyed home in south Oklahoma City, Monday, May 20, 2013. A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/The Oklahoman, Paul Hellstern) ( Severe Weather )

Destroyed cars are seen after a huge tornado struck Moore, Oklahoma May 20, 2013. A huge tornado with winds of up to 200 miles per hour devastated the Oklahoma City suburb of Moore on Monday, ripping up at least two elementary schools and a hospital and leaving a wake of tangled wreckage. At least four people were killed, KFOR television said, citing a reporter's eyewitness account, and hospitals said dozens of people were injured as the dangerous storm system threatened as many as 10 U.S. states with more twisters. REUTERS/Gene Blevins ( USA-TORNADOS/ )

People look at the destruction after a huge tornado struck Moore, Oklahoma May 20, 2013. A huge tornado with winds of up to 200 miles per hour devastated the Oklahoma City suburb of Moore on Monday, ripping up at least two elementary schools and a hospital and leaving a wake of tangled wreckage. At least four people were killed, KFOR television said, citing a reporter's eyewitness account, and hospitals said dozens of people were injured as the dangerous storm system threatened as many as 10 U.S. states with more twisters. REUTERS/Gene Blevins ( USA-TORNADOS/ )

A tornado passes across south Oklahoma City, Monday, May 20, 2013. A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/The Oklahoman, Paul Hellstern) ( Severe Weather )

A child is pulled from beneath a collapsed wall at the Plaza Towers Elementary School in following a tornado in Moore, Okla., Monday, May 20, 2013. (AP Photo Sue Ogrocki) ( Severe Weather )

A child is carried from the rubble of the Plaza Towers Elementary School following a tornado in Moore, Okla., Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Sue Ogrocki) ( Severe Weather )

Law enforcement officials arrive on the scene after a huge tornado struck Moore, Oklahoma, near Oklahoma City, May 20, 2013. The powerful tornado that struck the town of Moore, Oklahoma, on Monday was given a preliminary rating of at least EF4, or the second highest strength level, with winds of up to 200 miles per hour (321 kph), a U.S. government agency said. REUTERS/Richard Rowe ( USA-TORNADOES/ )

A boy is pulled from beneath a collapsed wall at the Plaza Towers Elementary School following a tornado in Moore, Okla., Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/ Sue Ogrocki) ( Severe Weather )

A boy is pulled from beneath a collapsed wall at the Plaza Towers Elementary School following a tornado in Moore, Okla., Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometer) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on the elementary school. (AP Photo Sue Ogrocki) ( APTOPIX Severe Weather )

Moore police dig through the rubble of the Plaza Towers Elementary School following a tornado in Moore, Okla., Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Sue Ogrocki) ( Severe Weather )

Rescue workers dig through the rubble of a collapsed wall at the Plaza Tower Elementary School to free trapped students in Moore, Okla., following a tornado Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki) ( Severe Weather )

A shredded tree stands amid debris after a massive tornado touched down in the town of Moore, near Oklahoma City, Oklahoma May 20, 2013. A huge tornado with winds of up to 200 miles per hour (320 kph) tore through the Oklahoma City suburb of Moore on Monday, ripping up at least two schools and leaving a wake of tangled wreckage as a dangerous storm system threatened as many as 10 U.S. states. REUTERS/Richard Rowe ( USA-TORNADOES/ )

A fire burns in the Tower Plaza Addition in Moore, Okla., following a tornado Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki) ( Severe Weather )

A child calls to his father after being pulled from the rubble of the Tower Plaza Elementary School following a tornado in Moore, Okla., Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki) ( Severe Weather )

Onlookers watch as children are pulled from the rubble of the Plaza Towers Elementary School following a tornado in Moore, Okla., Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki) ( Severe Weather )

Overturned cars are seen after a huge tornado touched down in the town of Moore, near Oklahoma City, Oklahoma May 20, 2013. The huge tornado that struck the town of Moore, Oklahoma, on Monday was given a preliminary rating of at least EF4, or the second highest strength level, with winds of up to 200 miles per hour (321 kph), a U.S. government agency said. REUTERS/Richard Rowe ( USA-TORNADOES/ )

A shopping center and parking lot are filled with debris after a huge tornado struck in Moore, Oklahoma near Oklahoma City, Oklahoma May 20, 2013. The huge tornado that struck the town of Moore, Oklahoma, on Monday was given a preliminary rating of at least EF4, or the second highest strength level, with winds of up to 200 miles per hour (321 kph), a U.S. government agency said. REUTERS/Richard Rowe ( USA-TORNADOES/ )

A woman is pulled out from under tornado debris at the Plaza Towers School in Moore, Okla., Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki) ( Severe Weather )

A child is pulled from the rubble of the Plaza Towers Elementary School in Moore, Okla., and passed along to rescuers Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school.(AP Photo Sue Ogrocki) ( Severe Weather )

A woman carries an injured child to a triage center near the Plaza Towers Elementary School in Moore, Okla., Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki) ( Severe Weather )

Overturned cars are seen after a massive tornado touched down near Oklahoma City, Oklahoma May 20, 2013. A devastating tornado struck an Oklahoma City suburb on Monday and the National Weather Service urged residents to immediately take cover as a large storm system in the middle of the country threatened to pummel as many as 10 states. REUTERS/Richard Rowe ( USA-TORNADOES/ )

A woman carries her child through a field near the collapsed Plaza Towers Elementary School in Moore, Okla., Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki) ( APTOPIX Severe Weather )

Overturned cars are seen from destruction from a huge tornado near Oklahoma City, Oklahoma May 20, 2013. A huge tornado touched down on Monday near Oklahoma City, and the National Weather Service urged residents to immediately take cover as a massive storm system in the middle of the country threatened to pummel as many as 10 states. REUTERS/Richard Rowe ( USA-TORNADOES/ )

This photo provided by KFOR-TV shows a house fire outside Moore, Okla., Monday, May 20, 2013. A monstrous tornado as much as a mile wide roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/KFOR-TV) ( Severe Weather )

This handout photo taken and released by Astrium on May 23, 2013, shows two satellite views of Moore, Oklahoma, before (Top) and after (Bottom) the passage of a powerful tornado, classified as an EF5, which passed through the town on May 20, destroying homes, schools and businesses and killing 24 people including children. The twister flattened block after block of homes as it struck mid-afternoon, hurling cars through the air, downing power lines and setting off localized fires in a 45-minute rampage. AFP PHOTO / ASTRIUM SERVICES 2013 ( 519997671 )