People react in front of the Plaza Towers Elementary school in Moore following a deadly tornado, Monday, May 20, 2013. (AP Photo/ The Oklahoman, Sarah Phipps) (AP2013)
A woman carries a child through a field near the collapsed Plaza Towers Elementary School in Moore, Okla., Monday, May 20, 2013. The relationship between the woman and the child was not immediately known. A tornado as much as half a mile (.8 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) (THE ASSOCIATED PRESS2013)
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) (THE ASSOCIATED PRESS2013)
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) (AP2013)
A worker clears debris from the southbound lanes of I-35 in Moore, Okla. after a tornado moves through the area on Monday, May 20, 2013. (AP Photo/Alonzo Adams) (AP2013)
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) (AP2013)
People go through the debris near Telephone Road and SW 4th Street after a tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams) (AP2013)
Debris lays on the northbound lanes of I-35 just south of SW 4th street in Moore, Okla. after a tornado moves through the area on Monday, May 20, 2013. (AP Photo/Alonzo Adams) (AP2013)
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. (AP Photo Sue Ogrocki) (AP2013)
This aerial photo shows damage to Moore Medical Center 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) (THE ASSOCIATED PRESS2013)
Searchers rest outside the Briarwood Elementary School after the tornado destroyed the school , Monday, May 20, 2013. (AP Photo/ The Oklahoman, David McDaniel) (AP2013)
CORRECTS TORNADO MEASUREMENT TO NUMBER REPORTED BY THE NATIONAL WEATHER SERVICE - This photo provided by KFOR-TV shows a car pile-up outside Moore, Okla., Monday, May 20, 2013. A monstrous tornado as much as half 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) (AP2013)
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 ) (AP2013)
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) (AP2013)
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) (AP2013)
A man and a woman assist a state trooper carry a large tarp to cover a tornado victim found in a field across the street from the Madison Place Addition, near SE 8 and Tower in Moore, on Monday, May 20, 2013. (AP Photo/ The Oklahoman, Jim Beckel) (AP2013)
The remains of a car destroyed by a tornado that hit the area near 149th and Drexel on Monday, May 20, 2013 in Oklahoma City, Okla. (AP Photo/ The Oklahoman, Chris Landsberger) (CHRIS LANDSBERGER/THE OKLAHOMAN2013)
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) (AP2013)
Emergency crews recover a body from the 7-11 store at the corner of Telephone Road and SW 4th Street after a tornado in Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams) (AP2013)
Workers walk past the rubble of Plaza Towers Elementary School after a tornado moved through Moore, Okla., Monday, May 20, 2013. (AP Photo Sue Ogrocki) (AP2013)
Magen Stanley, 5, walks away from her grandparents destroyed home after a tornado hit the area near 149th and Drexel on Monday, May 20, 2013 in Oklahoma City, Okla. (AP Photo/ The Oklahoman, Chris Landsberger) (CHRIS LANDSBERGER/THE OKLAHOMAN2013)
Gene Tripp 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) (CHRIS LANDSBERGER/THE OKLAHOMAN2013)
Cindy Wilson texts to friends after her home was destroyed in the afternoon tornado. Cindy and her husband, Staff Sgt. B. Wilson, took cover in their home's bathtub when the tornado hit. Cindy received a deep gash to her forehead and her wound was treated by first responders at the scene. Tornado caused extensive damage in the Madison Place Addition, near SE 8 and Tower in Moore, on Monday, May 20, 2013. (AP Photo/ The Oklahoman, Jim Beckel) (AP2012)
People react in front of the Towers Plaza Elementary school in Moore following a deadly tornado, Monday, May 20, 2013. Photo by Sarah Phipps, The Oklahoman (AP2013)
This aerial photo shows the remains of houses in Moore, Okla., following a tornado 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) (THE ASSOCIATED PRESS2013)
Damaged cars lay ruined at a business parking lot west of Interstate 35, south of 4th Street in Moore, Okla., on Monday, May 20, 2013. (AP Photo/The Oklahoman, Jim Beckel) (AP2012)
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 half a mile (.8 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) (THE ASSOCIATED PRESS2013)
The Moore Medical Center and vehicles lay damaged after a tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams) (AP2013)
Two men attempt to pry open a door on this car to check for victims in a business parking lot west of I-35 south of 4th Street in Moore, on 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, Jim Beckel) (THE ASSOCIATED PRESS2013)
Dos hombres intentan abrir la puerta de un vehículo para ver si hay víctimas dentro después de que un enorme tornado destruyera varios vecindarios en Oklahoma City, el lunes 20 de mayo de 2013. (Foto AP/The Oklahoman, Jim Beckel) (THE ASSOCIATED PRESS2013)
Chole Findley walks with her grandson Mark Williams as they leave the area where their home was destroyed after the tornado hit the area near 149th and Drexel on Monday, May 20, 2013 in Oklahoma City, Okla.(AP Photo/ The Oklahoman, Chris Landsberger) (CHRIS LANDSBERGER/THE OKLAHOMAN2013)
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) (AP2013)
A couple after a tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams) (AP2013)
A man searches debris near Telephone Road and SW 4th after a tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams) (AP2013)
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) (CHRIS LANDSBERGER/THE OKLAHOMAN2013)
Antonio Flores of Moore, Okla. searches for his car after a tornado damaged the Moore Medical Center and the vehicles in the parking lot in Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams) (AP2013)
People search the debris near Telephone Road and SW 4th Street in Moore, Okla. after a tornado on Monday, May 20, 2013. (AP Photo/Alonzo Adams) (AP2013)
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 half a mile (.8 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) (AP2013)
A car in the parking lot of the Moore Medical Center is marked as a Biohazard after a massive tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams) (AP2013)
A Moore Medical Center patient sits in the parking lot after a tornado damaged the hospital in Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams) (AP2013)
A man searches a damaged home near SW 4th Street and Telephone Road after a tornado moved through Moore, Okla., on Monday, May 20, 2013. (AP Photo/Alonzo Adams) (AP2013)
Rachel Hilton holds stray kittens she found in the debris of her parents' home at SW 149th and Stone Meadows Dr. after a tornado struck south Oklahoma City and Moore, Okla., Monday, May 20, 2013. (AP Photo/The Oklahoman, Nate Billings)
This aerial photo shows the Moore Medical center in Moore, Okla., following a tornado 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) (THE ASSOCIATED PRESS2013)
A security officer marks vehicles with spray paint after checking for victims and determining no one is inside, at a business complex west of Interstate 35, south of 4th Street in Moore, Okla., on Monday, May 20, 2013. (AP Photo/The Oklahoman, Jim Beckel) (AP2012)
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) (AP2013)