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In this photo combination, Kevin Kressler carries away debris at his tornado-ravaged home on May 25, 2013, in Moore, Okla., top. Kressler stands for a photo in front of his new home on May, 8, 2014, bottom. Kressler was one of the first residents to move back to his neighborhood after a massive tornado on May 20, 2013, leveled blocks around him in the Oklahoma City suburb. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

This aerial photo combination shows the damage to a neighborhood on May 21, 2013, the day after a massive tornado hit Moore, Okla., top, and reconstruction continues in the neighborhood on May 15, 2014, bottom. (AP Photo) ( Moore Tornado Anniversary Photo Gallery )

In this photo combination, Carol Kawaykla salvages items at her tornado-ravaged home on May 23, 2013, in Moore, Okla., top, and Kawaykla stands for a photo in her new home near the same area on May 7, 2014, bottom. Kawaykla said she misses some personal items lost in the tornado, but is more concerned with safety of children in schools during storms. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

A sign reading "Whatever will come or way thru fire or tornadoes we will not be shaken" is seen painted on the garage door of a home as the town prepares for Tuesday's one year anniversary of the town being devastated by a tornado on May 18, 2014 in Moore, Oklahoma. On May 20, 2013, a two-mile wide EF5 tornado touched down in the town, killing 24 people and leaving behind extensive damage to homes and businesses. (Photo by Joe Raedle/Getty Images) ( 492040205 )

In this photo combination, Rick Brown puts on a pair of boots after finding them in his tornado-ravaged home in Moore, Okla., on May 22, 2013, top, and sits on the now-cleared lot on May 8, 2014, bottom. Brown said construction should start soon on a new home to replace the one destroyed by the massive tornado that tore a wide swath through the Oklahoma City suburb on May 20, 2013. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

This photo combination shows an underground shelter among tornado rubble, May 26, 2013, in Moore, Okla. top, and the shelter virtually unchanged on May 7, 2014. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

In this photo combination, volunteers pray at a makeshift memorial on May 26, 2013, outside Plaza Towers Elementary School in Moore, Okla., the day after seven students died when a massive tornado hit the town, top. A boy walks past the rebuilt school building on the same site on May 7, 2014, bottom. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

This combination of aerial photos shows the damage to homes and businesses on May 21, 2013, the day after a massive tornado hit Moore, Okla., top, and the same neighborhood under reconstruction on May 15, 2014, bottom. (AP Photo) ( Moore Tornado Anniversary Photo Gallery )

In this photo combination, Monty Montgomery surveys the scene as he prepares to clean up a friend's tornado-ravaged home on May 23, 2013, in Moore, Okla., top, and the site on the outskirts of the Oklahoma City suburb is cleared and barren on May 8, 2014, bottom. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

In this photo combination, Abby Cotten sorts through the tornado-ravaged home she shared with her parents in Moore, Okla., May 25, 2013, several days after it was destroyed by an EF-5 tornado, top, and Cotten visits the site on May, 8, 2014, bottom. She said that she plans to start construction this summer on a new home for herself on the lot after her parents decided to not move back to the location. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

In this May 20, 2013, file photo, LaTisha Garcia carries her 8-year-old daughter, Jazmin Rodriguez, near Plaza Towers Elementary School after a massive tornado carved its way through Moore, Okla., leaving little of the school and neighborhood. (AP Photo/Sue Ogrocki, File) ( Moore Tornado Anniversary Photo Gallery )

In this photo combination, Farmers Insurance worker Paul Gaipo looks through tornado-damaged cars to determine which company insured the vehicles at a destroyed strip mall on May 22, 2013, in Moore, Okla., top, and workers prepare footings for a new business building near the site on May 8, 2014, bottom. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

In this photo combination, Katie Thomas sorts through debris at a friend's tornado-ravaged daycare on May 21, 2013, in Moore, Okla., top. A concrete slab is all that remains of the shopping center that contained the daycare on May, 8, 2014, bottom. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

ADVANCE FOR USE MONDAY, MAY 19, AND THEREAFTER - In this photo combination, volunteers pray at a makeshift memorial on May 26, 2013, outside Plaza Towers Elementary School in Moore, Okla., the day after seven students died when a massive tornado hit the town, top. A boy walks past the rebuilt school building on the same site on May 7, 2014, bottom. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

In this photo combination, Lea Bessinger, left, salvages a depiction of Jesus as she and her son, Josh Bessinger, sort through the rubble of her tornado-ravaged home in Moore, Okla., May 21, 2013, top. A vacant lot is all that remains on the site on May 7, 2014, bottom. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

A fireplace is seen where a house once stood as preparations are under way for Tuesday's one-year anniversary of the town being devastated by a tornado on May 18, 2014 in Moore, Oklahoma. On May 20, 2013, a two-mile wide EF5 tornado touched down in the town, killing 24 people and leaving behind extensive damage to homes and businesses. (Photo by Joe Raedle/Getty Images) ( 492040191 )

In this photo combination, Dalton Sprading, right, hands a gun to his uncle Roger Craft as he salvages items from his tornado-ravaged home in Moore, Okla., May 21, 2013, top, and the site remains empty while other houses rise in the background on May 8, 2014, bottom. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

In this photo combination, a tornado-ravaged home stands in the distance beyond a twisted street sign on May 22, 2013, in Moore, Okla., top, and the lot is cleared and a new homes stand next door on May 8, 2014, bottom. Moore continues to rebuild in the wake of a massive tornado that tore through Oklahoma City suburb on May 20, 2013. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

In this photo combination, Katie Thomas sorts through debris at a friend's tornado-ravaged daycare on May 21, 2013, in Moore, Okla., top. A concrete slab is all that remains of the shopping center that contained the daycare on May, 8, 2014, bottom. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

This aerial photo combination shows the damage to the Moore Medical Center Emergency Services on May 21, 2013, after a massive tornado hit Moore, Okla., the day before, top, and the same view on May 15, 2014, bottom. (AP Photo) ( Moore Tornado Anniversary Photo Gallery )

In this photo combination, Ben Osborne surveys the scene as he sorts through his tornado-ravaged home on May 22, 2013, in Moore, Okla., top, and Osborne stands for photo with his wife Deidra and daughter Hannah, on the site where Deidra rode out the storm in shelter with 13 of her neighbors on May 8, 2014. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

In this May 20, 2013, file photo, a boy is pulled from beneath a collapsed wall at the Plaza Towers Elementary School following a tornado in Moore, Okla. (AP Photo/Sue Ogrocki, File) ( Moore Tornado Anniversary Photo Gallery )

In this photo combination, Ben Osborne surveys the scene as he sorts through his tornado-ravaged home on May 22, 2013, in Moore, Okla., top, and Osborne stands for a photo with his wife Deidra and daughter Hannah, May 8, 2014, on the site where Deidra rode out the storm in shelter with 13 of her neighbors. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )

In this May 20, 2013, file photo, Jennifer Doan, a teacher at Plaza Towers Elementary School, is pulled out from under tornado debris at the school in Moore, Okla. (AP Photo/Sue Ogrocki, File) ( Moore Tornado Anniversary Photo Gallery )

This aerial photo combination shows the damage to the Tower Plazas Elementary School, May 21, 2013, in Moore, Okla., after seven students died when a massive tornado hit school on May 20, top, and reconstruction continues at the school on May 15, 2014, bottom. (AP Photo) ( Moore Tornado Anniversary Photo Gallery )

In this May 20, 2013, file photo, a child calls to his father after being pulled from the rubble of the Tower Plaza Elementary School following a tornado in Moore, Okla. (AP Photo Sue Ogrocki, File) ( Moore Tornado Anniversary Photo Gallery )

In this photo combination, Monty Montgomery surveys the scene as he prepares to clean up a friend's tornado-ravaged home on May 23, 2013, in Moore, Okla., top, and the site on the outskirts of the Oklahoma City suburb is cleared and barren on May 8, 2014, bottom. (AP Photo/Charlie Riedel) ( Moore Tornado Anniversary Photo Gallery )