Weather

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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)

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This combination of aerial photos shows the path of destruction on May 21, 2013, the day after a massive tornado hit Moore, Okla., left, and the same view on May 15, 2014, right. (AP Photo)

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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)

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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)

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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)

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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)

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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)