Lightning from a thunderstorm strikes amid the wreckage of twisted cars and structures at Plaza Elementary School, where seven children were killed earlier in the week when a tornado hit Moore, Oklahoma, on May 23, 2013. #

David Lee Estep sits atop a rubble pile that was once a home he shared with his parents and waits for word about his parent's welfare in Moore, on on May 23, 2013. Estep had not heard from his parents since their home collapsed on the three of them after it was hit by a tornado. Shortly after this picture was taken aid workers arrived to tell him his parents were well and they were looking for him. #

A man yells at the media asking them to leave after attending a memorial service for nine-year-old Antonia Candelaria at Vondel Smith Mortuary South Colonial Chapel on May 23, 2013 in Oklahoma City, Oklahoma. Candelaria was a student at Plaza Towers Elementary School and was in class when a powerful tornado tore through the town. #

U.S. Air Force Tech. Sgt. Ben Lake passes a family photo to Elise Hopkins while searching through the debris looking for salvageable items in what is left of her home, in Moore, on May 22, 2013. #

Lela Carter, 7, looks through children's books while standing around rows of items residents were donating to victims of a deadly tornado, at a church in Oklahoma City on May 23, 2013. #

Christine Jones (left) is comforted by her cousin, Ann Worden, as she talks about looking for lost wedding rings at her tornado demolished home in Moore, on May 23, 2013. #

Brittany Brown rushes to get aid after finding her grandmother's cat "Kitty" which was buried in tornado rubble for two days at the grandmother's destroyed home in Moore, on May 22, 2013. #

Justin Stephan explains to his son Timothy, 3, that he can't play with a toy of his that he found in his tornado-destroyed home on 6th Avenue in Moore, on May 23, 2013. #

Crissy Gregg (left) and Lauren Hogan (carrying air rifles), help their relative Jennifer Walker, not pictured, recover items from her tornado damaged home in Moore, on May 22, 2013. #

A television journalist, her shoes covered in plastic bags, prepares to report from the suburb of Moore, Oklahoma which was left devastated by a tornado, on May 21, 2013. #

Danielle Stephan holds boyfriend Thomas Layton as they pause between sifting through the remains of a family member's home one day after a tornado devastated the town Moore, on May 21, 2013. #

Hayley Hawk, 11, outside of a neighbors destroyed home in Moore, on May 22, 2013. Hawk was a student of Plaza Towers Elementary school but was picked-up by her parent before the school was damaged. #

Seven crosses sit along the curb in front of what was once the home of Scott and Julie Lewis before it was destroyed by a tornado on May 23, 2013 in Moore, Oklahoma. The crosses were placed in memory of the seven children from Plaza Towers Elementary School who lost their lives in the tornado. As the tornado approached, Scott Lewis drove to the school and picked up his son Zack, who attended 3rd grade at Plaza Towers, and brought him to their storm shelter. Most of the children who died at the school were classmates of Zack. #

Jayme Sheppard carries her daughter Hope, who was enrolled in kindergarten at the storm-damaged Plaza Towers elementary school, on her shoulders as she departs a ceremonial last day of the school year at the Eastlake Elementary School in Oklahoma City, on May 23, 2013. #

Sabrina Mitchell fights back emotions as she searches for her belongings in what was the second floor bedroom of her home after it was destroyed by a tornado in Moore, Oklahoma, on May 24, 2013. #