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An aerial image from KXAS-NBC5 Dallas-Ft Worth video footage shows tornado damage left behind in Hood County, Texas, May 16, 2013. At least six people were killed and scores more injured when tornadoes ripped through a stretch of Texas near Dallas-Fort Worth after dark on Wednesday, destroying homes and uprooting trees, authorities said. REUTERS/Courtesy of KXAS-NBC5 Dallas-Ft Worth via Reuters ( USA-TEXAS/TORNADOES )

An aerial image from KXAS-NBC5 Dallas-Ft Worth video footage shows tornado damage left behind in Hood County, Texas, May 16, 2013. At least six people were killed and scores more injured when tornadoes ripped through a stretch of Texas near Dallas-Fort Worth after dark on Wednesday, destroying homes and uprooting trees, authorities said. REUTERS/Courtesy of KXAS-NBC5 Dallas-Ft Worth via Reuters ( USA-TEXAS/TORNADOES )

An aerial image from KXAS-NBC5 Dallas-Ft Worth video footage shows tornado damage left behind in Hood County, Texas, May 16, 2013. At least six people were killed and scores more injured when tornadoes ripped through a stretch of Texas near Dallas-Fort Worth after dark on Wednesday, destroying homes and uprooting trees, authorities said. REUTERS/Courtesy of KXAS-NBC5 Dallas-Ft Worth via Reuters ( USA-TEXAS/TORNADOES )

Lightning strikes from a storm illuminates the sky where damage is strewn about the street and light pole near Hyde Park Lane at Country Club Rd. after a tornado in Cleburne, Texas, Wednesday night, May 15, 2013. Cleburne Mayor Scott Cain early Thursday declared a local disaster as schools canceled classes amid the destruction. (AP Photo/The Dallas Morning News, Tom Fox) ( Texas Storms )

Derrek Grisham, left, points out neighborhood damage to storm chaser Travis Schafer after a tornado damaged his mother's house on Hyde Park Lane at Country Club Rd. in Cleburne, Texas,Wednesday night, May 15, 2013. Cleburne Mayor Scott Cain early Thursday declared a local disaster as schools canceled classes amid the destruction. (AP Photo/The Dallas Morning News, Tom Fox) ( Texas Storms )

Lightning strikes from a storm illuminate a home damaged by a tornado on Hyde Park Lane at Country Club Rd. in Cleburne, Wednesday night, May 15, 2013. Cleburne Mayor Scott Cain early Thursday declared a local disaster as schools canceled classes amid the destruction. (AP Photo/The Dallas Morning News, Tom Fox) ( Texas Storms )

A trailer blown into a home on Lindsay Lane in Cleburne rests on a car after a tornado touch down in Cleburne, Texas May 16, 2013. At least six people were killed and seven were missing after as many as 10 tornadoes ripped through north-central Texas Wednesday evening, leaving a trail of destruction from the worst severe storm outbreak in the United States so far this year. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

A large hole was blown out of the roof of a home on Lakeshore Dr. outside of Cleburne, after a tornado Wednesday night, May 15, 2013. The top of the roof was still intact leaving a large hole through the roof of Lake Pat Cleburne home. Cleburne Mayor Scott Cain early Thursday declared a local disaster as schools canceled classes amid the destruction. (AP Photo/The Dallas Morning News, Tom Fox) ( Texas Storms )

An aerial image from KXAS-NBC5 Dallas-Ft Worth video footage shows tornado damage left behind in Hood County, Texas, May 16, 2013. At least six people were killed and scores more injured when tornadoes ripped through a stretch of Texas near Dallas-Fort Worth after dark on Wednesday, destroying homes and uprooting trees, authorities said. REUTERS/Courtesy of KXAS-NBC5 Dallas-Ft Worth via Reuters ( USA-TEXAS/TORNADOES )

An aerial image from KXAS-NBC5 Dallas-Ft Worth video footage shows tornado damage left behind in Hood County, Texas, May 16, 2013. At least six people were killed and scores more injured when tornadoes ripped through a stretch of Texas near Dallas-Fort Worth after dark on Wednesday, destroying homes and uprooting trees, authorities said. REUTERS/Courtesy of KXAS-NBC5 Dallas-Ft Worth via Reuters ( USA-TEXAS/TORNADOES )

A trailer blown into a home on Lindsay Lane in Cleburne rests on a car after a tornado touch down in Cleburne, Texas May 16, 2013. At least six people were killed and seven were missing after as many as 10 tornadoes ripped through north-central Texas Wednesday evening, leaving a trail of destruction from the worst severe storm outbreak in the United States so far this year. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

An aerial image from KXAS-NBC5 Dallas-Ft Worth video footage shows tornado damage left behind in Hood County, Texas, May 16, 2013. At least six people were killed and scores more injured when tornadoes ripped through a stretch of Texas near Dallas-Fort Worth after dark on Wednesday, destroying homes and uprooting trees, authorities said. REUTERS/Courtesy of KXAS-NBC5 Dallas-Ft Worth via Reuters ( USA-TEXAS/TORNADOES )

An aerial image from KXAS-NBC5 Dallas-Ft Worth video footage shows tornado damage left behind in Hood County, Texas, May 16, 2013. At least six people were killed and scores more injured when tornadoes ripped through a stretch of Texas near Dallas-Fort Worth after dark on Wednesday, destroying homes and uprooting trees, authorities said. REUTERS/Courtesy of KXAS-NBC5 Dallas-Ft Worth via Reuters ( USA-TEXAS/TORNADOES )

Utility workers attempt to repair power lines and restore power to a neighborhood after a tornado touched down in Cleburne, Texas May 16, 2013. At least six people were killed and seven were missing after as many as 10 tornadoes ripped through north-central Texas Wednesday evening, leaving a trail of destruction from the worst severe storm outbreak in the United States so far this year. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

An aerial image from KXAS-NBC5 Dallas-Ft Worth video footage shows tornado damage left behind in Hood County, Texas, May 16, 2013. At least six people were killed and scores more injured when tornadoes ripped through a stretch of Texas near Dallas-Fort Worth after dark on Wednesday, destroying homes and uprooting trees, authorities said. REUTERS/Courtesy of KXAS-NBC5 Dallas-Ft Worth via Reuters ( USA-TEXAS/TORNADOES )

The living room of a home that had its roof blown off by a tornado is pictured in Cleburne, Texas May 16, 2013. At least six people were killed and seven were missing after as many as 10 tornadoes ripped through north-central Texas Wednesday evening, leaving a trail of destruction from the worst severe storm outbreak in the United States so far this year. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

An aerial image from KXAS-NBC5 Dallas-Ft Worth video footage shows tornado damage left behind in Hood County, Texas, May 16, 2013. At least six people were killed and scores more injured when tornadoes ripped through a stretch of Texas near Dallas-Fort Worth after dark on Wednesday, destroying homes and uprooting trees, authorities said. REUTERS/Courtesy of KXAS-NBC5 Dallas-Ft Worth via Reuters ( USA-TEXAS/TORNADOES )

Pete Alaniz assesses the damage to the garage of his rental home that was destroyed by a tornado in Cleburne, Texas May 16, 2013. At least six people were killed and seven were missing after as many as 10 tornadoes ripped through north-central Texas Wednesday evening, leaving a trail of destruction from the worst severe storm outbreak in the United States so far this year. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

A trailer blown into a home on Lindsay Lane in Cleburne rests on a car after a tornado touched down in Cleburne, Texas May 16, 2013. At least six people were killed and seven were missing after as many as 10 tornadoes ripped through north-central Texas Wednesday evening, leaving a trail of destruction from the worst severe storm outbreak in the United States so far this year. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

A child rides his bike past damaged homes on Thursday, May 16, 2013, after a tornado destroyed part of Cleburne, Texas late Wednesday night. A rash of tornadoes slammed into several small communities in North Texas overnight, leaving at least six people dead, dozens more injured and hundreds homeless. The violent spring storm scattered bodies, flattened homes and threw trailers onto cars. (AP Photo/The Dallas Morning News, Michael Ainsworth) ( Texas Storms )

Part of a pine tree sits in the middle of the road on Thursday, May 16, 2013 in Cleburne, Texas. A rash of tornadoes slammed into several small communities in North Texas overnight, leaving at least six people dead, dozens more injured and hundreds homeless. The violent spring storm scattered bodies, flattened homes and threw trailers onto cars. (AP Photo/The Dallas Morning News, Michael Ainsworth) ( Texas Storms )

Utility workers try to restore electric power on down lines on Thursday, May 16, 2013, in Cleburne, Texas. A rash of tornadoes slammed into several small communities in North Texas overnight, leaving at least six people dead, dozens more injured and hundreds homeless. The violent spring storm scattered bodies, flattened homes and threw trailers onto cars. (AP Photo/The Dallas Morning News, Michael Ainsworth) ( Texas Storms )

Residents tour the damage on Thursday, May 16, 2013, after a tornado destroyed part of Cleburne, Texas Wednesday night. A rash of tornadoes slammed into several small communities in North Texas overnight, leaving at least six people dead, dozens more injured and hundreds homeless. The violent spring storm scattered bodies, flattened homes and threw trailers onto cars. (AP Photo/The Dallas Morning News, Michael Ainsworth) ( Texas Storms )

Debris surrounds a damaged vehicle on Thursday, May 16, 2013, in Cleburne, Texas. A rash of tornadoes slammed into several small communities in North Texas overnight, leaving at least six people dead, dozens more injured and hundreds homeless. The violent spring storm scattered bodies, flattened homes and threw trailers onto cars. (AP Photo/The Dallas Morning News, Michael Ainsworth) ( Texas Storms )

People look at damage as they help to start cleaning up and salvage items from a home that was destroyed by a tornado in Cleburne, Texas, Thursday, May 16, 2013. (AP Photo/LM Otero) ( Texas Storms )

Rescue workers comb through debris after tornados swept through the town of Granbury, Texas May 16, 2013. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

Rescue workers comb through debris May 16, 2013 after tornados swept through the town of Granbury, Texas late May 15. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

The door of a house is impaled on a tree May 16 after tornados swept through the town of Granbury, Texas late May 15, 2013. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

Rescue workers walk past debris May 16 after tornados swept through the town of Granbury, Texas late May 15, 2013. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

A stop sign lies among debris May 16 after tornados swept through the town of Granbury, Texas late May 15, 2013. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

A damaged home and car remain May 16 after tornados swept through the town of Granbury, Texas late May 15, 2013. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

A rescue worker combs through debris May 16 after tornados swept through the town of Granbury, Texas late May 15, 2013. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

Rescue workers comb through debris May 16 after tornados swept through the town of Granbury, Texas late May 15, 2013. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

Firefighters walk past debris May 16 after tornados swept through the town of Granbury, Texas late May 15, 2013. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

People check out the damage to downtown Ennis, Texas on Thursday, May 16, 2013. (AP Photo/The Dallas Morning News, Vernon Bryant) ( Texas Storms )

Blown out sign at Diary Queen stands along Ennis Ave. in Ennis, Texas on Thursday, May 16, 2013. (AP Photo/The Dallas Morning News, Vernon Bryant) ( Texas Storms )

Lauren Seay looks for items to recover in the bedroom of home that was destroyed by a tornado in Cleburne, Texas, Thursday, May 16, 2013. (AP Photo/LM Otero) ( Texas Storms )

Lisa Montgomery, right, hugs her nephew Jeremy Hulce as her sons Dillon Montgomery, 10, left, and Derrek Girsham look on in front of her home that was destroyed by a tornado in Cleburne, Texas, Thursday, May 16, 2013. Ms. Montgomery rode out the twister the night before in her bathtub with her 10-year-old son. (AP Photo/LM Otero) ( Texas Storms )

A toppled car lies next to and crushed trees in the Rancho Brazos neighborhood of Granbury, Texas on Thursday, May 16, 2013. (AP Photo/The Fort Worth Star-Telegram, Paul Moseley) ( Granbury Storm 20 )

Crushed autos sit amid the rubble of destroyed homes as emergency personnel continue search efforts to locate unaccounted for people in the Rancho Brazos neighborhood in Granbury, Texas, Thursday, May 16, 2013. (AP Photo/The Fort Worth Star-Telegram, Paul Moseley) ( Texas Storms )

Crushed autos sit amid the rubble of destroyed homes as emergency personnel continue search efforts in the Rancho Brazos neighborhood in Granbury, Texas, Thursday, May 16, 2013. (AP Photo/The Fort Worth Star-Telegram, Paul Moseley) ( Texas Storms )

People help to start cleaning up and salvage items from a home that was destroyed by a tornado in Cleburne, Texas, Thursday, May 16, 2013. (AP Photo/LM Otero) ( Texas Storms )

Derrek Girsham, right, Jeremy Hulce, left, and Dustin Seay cut down a fan as they start cleaning up a home that was destroyed by a tornado in Cleburne, Texas, Thursday, May 16, 2013. (AP Photo/LM Otero) ( Texas Storms )

Crushed autos sit amid the rubble of destroyed homes as emergency personnel continue search efforts to locate unaccounted for people in the Rancho Brazos neighborhood in Granbury, Texas, Thursday, May 16, 2013. (AP Photo/The Fort Worth Star-Telegram, Paul Moseley) ( Texas Storms )

Homes are heavily damaged in this aerial view of Granbury, Texas on Thursday, May 16, 2013, after multiple tornados hit the area Wednesday night. Ten tornadoes touched down in several small communities in North Texas overnight, leaving at least six people dead, dozens injured and hundreds homeless. Emergency responders were still searching for missing people Thursday afternoon. (AP Photo/Star-Telegram/Ron T. Ennis) ( Texas Storms )

Lisa Montgomery pauses as she talks about surviving a tornado that destroyed her home in Cleburne, Texas, Thursday, May 16, 2013. Ms. Montgomery rode out the twister the night before in her bathtub with her 10-year-old son and is salvaging items with friends and family helping. (AP Photo/LM Otero) ( Texas Storms )

Rescue workers comb through debris May 16 after tornados swept through the town of Granbury, Texas late May 15, 2013. REUTERS/Richard Rodriguez ( USA-TORNADOES/TEXAS )

This aerial photo shows a home with extensive damage caused by Wednesday's tornado in Granbury, Texas on Thursday, May 16, 2013. (AP Photo/The Dallas Morning News, G.J.McCarthy) ( Texas Storms )

An aerial view shows the damage after tornados swept through Hood County, Texas May 16, 2013. REUTERS/Brandon Wade ( USA-TORNADOES/TEXAS )

An aerial view shows the damage after tornados swept through Hood County, Texas May 16, 2013. REUTERS/Brandon Wade ( USA-TORNADOES/TEXAS )

An aerial view shows the damage after tornados swept through Hood County, Texas May 16, 2013. REUTERS/Brandon Wade ( USA-TORNADOES/TEXAS )

An aerial view shows the damage after tornados swept through Hood County, Texas May 16, 2013. REUTERS/Brandon Wade ( USA-TORNADOES/TEXAS )

An aerial view shows the damage after tornados swept through Hood County, Texas May 16, 2013. REUTERS/Brandon Wade ( USA-TORNADOES/TEXAS )

An aerial view shows the damage after tornados swept through Hood County, Texas May 16, 2013. REUTERS/Brandon Wade ( USA-TORNADOES/TEXAS )

An aerial view shows the damage after tornados swept through Hood County, Texas May 16, 2013. REUTERS/Brandon Wade ( USA-TORNADOES/TEXAS )

An aerial view shows the damage after tornados swept through Hood County, Texas May 16, 2013. REUTERS/Brandon Wade ( USA-TORNADOES/TEXAS )

An aerial view shows the damage after tornados swept through Hood County, Texas May 16, 2013. REUTERS/Brandon Wade ( USA-TORNADOES/TEXAS )

A cleared home foundation stands out among the rubble in Granbury, Texas on Thursday, May 16, 2013. (AP Photo/Star-Telegram,Ron T. Ennis) ( Texas Storms )

A a roofless home is seen in Granbury, Texas on Thursday May 16, 2013. (AP Photo/The Fort Worth Star-Telegram, Ron T. Ennis ) ( Texas Storms )

This aerial photo shows upended trucks among debris caused by Wednesday's tornado in Granbury, Texas on Thursday, May 16, 2013. (AP Photo/The Dallas Morning News, G.J.McCarthy) ( Texas Storms )

Crushed autos sit amid the rubble as emergency personnel continue search efforts to locate people in that are unaccounted for in the destroyed Rancho Brazos neighborhood of Granbury, Texas, Thursday, May 16, 2013. (AP Photo/The Fort Worth Star-Telegram, Paul Moseley) ( Texas Storms )

Destroyed homes are seen in Granbury, Texas on Thursday May 16, 2013. (AP Photo/The Fort Worth Star-Telegram,Ron T. Ennis ) ( Texas Storms )

This aerial photo shows a leveled neighborhood on Thursday, May 16, 2013 in Granbury, Texas. (AP Photo/The Dallas Morning News, G.J.McCarthy) ( Texas Storms )

Emergency personnel look through debris on near Granbury, Texas on Thursday, May 16, 2013. (AP Photo/Rex C. Curry) ( APTOPIX Texas Storms )

This aerial photo shows the contents of home's living area damaged caused by Wednesday's tornado in Granbury, Texas on Thursday, May 16, 2013. (AP Photo/The Dallas Morning News, G.J.McCarthy) ( Texas Storms )

Heavily damaged homes Line a cul de sac in Granbury, Texas on Thursday May 16, 2013. (AP Photo/The Fort Worth Star-Telegram, Ron T. Ennis) ( Texas Storms )