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During a remembrance ceremony on the grounds of what once was the Moore Medical Center, Rosita Begay (L) hugs her daughter Amber McQuerry as they remember her mother-in-law Kathryn Begay who was killed during a tornado on May 20, 2014 in Moore, Oklahoma. A two-mile wide EF5 tornado touched down in the town on May 20, 2013, killing 24 people and leaving behind extensive damage to homes and businesses. (Photo by Joe Raedle/Getty Images) ( 492438163 )

During the remembrance ceremony for the victims of last year's tornado, some of the first responders bow their heads in prayer on May 20, 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) ( 492439057 )

David Friess remembers his lost pets as he puts flowers in the ground where his house used to be and his pet was found in the rubble one year ago when a tornado passed through the area on May 20, 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) ( 492416655 )

Xavier Delgado, center, and his sister, Haley Delgado, left, are greeted by Moore police Sgt. Alan Wallace, right, as arrive for the start of school at the temporary site for Plaza Towers Elementary school in Moore, Okla., Tuesday, May 20, 2014, one year after the May 20, 2013 tornado destroyed Plaza Towers school, leaving Xavier Delgado and other third graders trapped in the rubble. Wallace was on site at the school helping to rescue children the day of the tornado. (AP Photo/Sue Ogrocki) ( Moore Tornado Anniversary )

Rodney Cartmill (C) greets David Friess and his wife Ann Friess as they return to remember their pets on the spot where their house once stood and the pets died one year ago when a tornado passed through the area on May 20, 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) ( 492416507 )

DONETSK, UKRAINE - MAY 20: People depart a peace rally at the FC Shakhtar Donetsk soccer stadium on May 20, 2014 in Donetsk, Ukraine. Industrialist Rinal Akhmetov, Ukraine's wealthiest man, called for demonstrations across eastern Ukraine against pro-Russian separatists controling much of the region. (Photo by John Moore/Getty Images) ( 492422535 )

During the remembrance ceremony for the victims of last year's tornado, Oklahoma City paramedic Stephen Bagay (L) is hugged by Max Broderick on May 20, 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) ( 492438847 )

During the remembrance ceremony for the victims of last year's tornado, Jeremy Soulek holds a framed photograph of his sister, Shannon Quick, who died in the storm on May 20, 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) ( 492438843 )

During the remembrance ceremony for the victims of last year's tornado, Alecia Nicholson is hugged on May 20, 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) ( 492438861 )

Oklahoma Governor Mary Fallin greets people during the remembrance ceremony for the victims of last year's tornado on May 20, 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) ( 492439293 )

People hold hands during the remembrance ceremony for the victims of last year's tornado on May 20, 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) ( 492439299 )

Armand McCoy (L) and Jennifer Halstead carry a boquet of flowers past empty land where the Moore Medical Center used to stand during the remembrance ceremony for the victims of last year's tornado and a ground breaking for the new medical center on May 20, 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) ( 492439333 )

People hug during the remembrance ceremony for the victims of last year's tornado on May 20, 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) ( 492439339 )

David Friess and his wife Ann Friess hug after placing flowers in the ground where their house used to be and where one of their dead dogs was found in the rubble one year ago when a tornado passed through the area on May 20, 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) ( 492413435 )