El tornado que azotó a Oklahoma

SHAWNEE, OK – MAY 20: Volunteers help clean out Jean McAdams' mobile home after it was overturned by a tornado May 20, 2013 near Shawnee, Oklahoma. A series of tornados moved across central Oklahoma May 19, killing two people and injuring at least 21. Brett Deering/Getty Images/AFP

SHAWNEE, OK – MAY 20: Kasey Clark sorts through the debris of her grandmother-in-law Thelma Cox's mobile home after it was destroyed by a tornado May 20, 2013 near Shawnee, Oklahoma. A series of tornados moved across central Oklahoma May 19, killing two people and injuring at least 21. Brett Deering/Getty Images/AFP

SHAWNEE, OK – MAY 20: Candice Lopez (L) and Stephanie Davis help clean debris from Thelma Cox's mobile home after it was destroyed by a tornado May 20, 2013 near Shawnee, Oklahoma. A series of tornados moved across central Oklahoma May 19, killing two people and injuring at least 21. Brett Deering/Getty Images/AFP

MOORE, OK- MAY 20: Philip Gotcher stands in the rubble of his house after a powerful tornado ripped through the area on May 20, 2013 in Moore, Oklahoma. The tornado, reported to be at least EF4 strength and two miles wide, touched down in the Oklahoma City area on Monday killing at least 51 people. Brett Deering/Getty Images/AFP

MOORE, OK – MAY 20: (L – R) Yvonne Barragar, Joe Marshall and Barbara Garcia sit in front of Barragar's destroyed house after a powerful tornado ripped through the area on May 20, 2013 in Moore, Oklahoma. The tornado, reported to be at least EF4 strength and two miles wide, touched down in the Oklahoma City area on Monday killing at least 51 people. Brett Deering/Getty Images/AFP

MOORE, OK – MAY 20: A vehicle lies upside down in the road after a powerful tornado ripped through the area on May 20, 2013 in Moore, Oklahoma. The tornado, reported to be at least EF4 strength and two miles wide, touched down in the Oklahoma City area on Monday killing at least 51 people. Brett Deering/Getty Images/AFP

MOORE, OK- MAY 20: Piles of debris and mangled trees remain after a powerful tornado ripped through the area on May 20, 2013 in Moore, Oklahoma. The tornado, reported to be at least EF4 strength and two miles wide, touched down in the Oklahoma City area on Monday killing at least 51 people. Brett Deering/Getty Images/AFP

This photograph obtained courtesy of KFOR-TV in Oklahoma City, Oklahoma shows emergency crews searching amid destruction May 19, 2013 after a tornado ripped through Twin Lakes, Oklahoma. Tornadoes damaged many areas across the West South Central US state of Oklahoma. AFP PHOTO / KFOR-TV == RESTRICTED TO EDITORIAL USE / MANDATORY CREDIT: "AFP PHOTO / KFOR-TV "/ NO SALES / NO MARKETING / NO ADVERTISING CAMPAIGNS / DISTRIBUTED AS A SERVICE TO CLIENTS ==