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The funnel of a tornadic thunderstorm almost touches the ground near South Haven, in Kansas May 19, 2013. A massive storm front swept north through the central United States on Sunday, hammering the region with fist-sized hail, blinding rain and tornadoes, including a half-mile wide twister that struck near Oklahoma City. News reports said at least one person had died. REUTERS/Gene Blevins ( USA-OKLAHOMA-TORNADO )

A tornado touches down southwest of Wichita, Kan. near the town of Viola on Sunday, May 19, 2013. The tornado was part of a line of storms that past through the central plains on Sunday. (AP Photo/The Wichita Eagle, Travis Heying) ( Severe Weather )

Lightning from a tornadic thunderstorm passing over Clearwater, Kansas strikes at an open field May 19, 2013. A massive storm front swept north through the central United States on Sunday, hammering the region with fist-sized hail, blinding rain and tornadoes, including a half-mile wide twister that struck near Oklahoma City. News reports said at least one person had died. REUTERS/Gene Blevins ( USA-OKLAHOMA-TORNADO/ )

Jerry Dirks, at right, hugs her friend Earlene Langley after a tornado hit Driks' home just south of Carney Okla., on Sunday, May 19, 2013. Dirks was in her cellar at the time the tornado hit. (AP Photo/The Oklahoman, Bryan Terry) ( Severe Weather )

Debris is seen at a mobile home park which was destroyed by a tornado on Sunday, west of Shawnee, Oklahoma May 19, 2013. A tornado half a mile wide struck near Oklahoma City on Sunday, part of a massive storm front that hammered the central United States. News reports said at least one person had died. REUTERS/Bill Waugh ( USA-OKLAHOMA/TORNADO )

Allen Cook talks on his cell phone as he stands next to a downed tree which missed falling on a home in a mobile home park, where several other homes were destroyed by a tornado on Sunday, west of Shawnee, Oklahoma May 19, 2013. A tornado half a mile wide struck near Oklahoma City on Sunday, part of a massive storm front that hammered the central United States. News reports said at least one person had died. REUTERS/Bill Waugh ( USA-OKLAHOMA/TORNADO )

Brad Avery of Edmond, Oklahoma, clears downed trees from his driveway after a tornado swept through the eastern part of Edmond, Oklahoma May 19, 2013. A tornado half a mile wide struck near Oklahoma City on Sunday, part of a massive storm front that hammered the central United States. News reports said at least one person had died. REUTERS/Bill Waugh ( USA-OKLAHOMA/TORNADO )

Leah Hill (L), of Shawnee, Oklahoma, is hugged by friend Sidney Sizemore, as they look through Hill's scattered belongings from her home which was destroyed by a tornado, west of Shawnee, Oklahoma May 19, 2013 A tornado half a mile wide struck near Oklahoma City on Sunday, part of a massive storm front that hammered the central United States. News reports said at least one person had died. REUTERS/Bill Waugh ( USA-OKLAHOMA/TORNADO )

Vehicles are seen amongst storm debris, which is what is left of a mobile home park destroyed by a tornado, west of Shawnee, Oklahoma May 19, 2013. A tornado half a mile wide struck near Oklahoma City on Sunday, part of a massive storm front that hammered the central United States. News reports said at least one person had died. REUTERS/Bill Waugh ( USA-OKLAHOMA/TORNADO )

An aerial image shows an active tornado over the skies of Harrah, Oklahoma May 19, 2013, in this still image provided by KFOR-TV. A tornado half a mile wide struck near Oklahoma City on Sunday, part of a massive storm front that hammered the central United States. News reports said at least one person had died. Courtesy of KFOR-TV/Handout via Reuters ( USA-OKLAHOMA/TORNADO )

A resident waits to be allowed back to her mobile home after a tornado swept through the western part of Shawnee, Oklahoma May 19, 2013. A tornado half a mile wide struck near Oklahoma City on Sunday, part of a massive storm front that hammered the central United States. News reports said at least one person had died. REUTERS/Bill Waugh ( USA-OKLAHOMA/TORNADO )

Damaged structures are seen May 19, 2013 after a tornado ripped through Wellston, Oklahoma. Tornadoes damaged many areas across the state May 19, 2013 and are still forming. Homes have been destroyed, with the worst damage so far just outside of Wellston. AFP PHOTO / KFOR-TV ( 519882391 )

A tornado, one of several which touched down, is pictured near Viola, in Kansas May 19, 2013. A massive storm front swept north through the central United States on Sunday, hammering the region with fist-sized hail, blinding rain and tornadoes, including a half-mile wide twister that struck near Oklahoma City. News reports said at least one person had died. REUTERS/Gene Blevins ( USA-OKLAHOMA-TORNADO/ )

Storm chaser videographer and photographer Brad Mack records a tornado near a home in South Haven, in Kansas May 19, 2013. A massive storm front swept north through the central United States on Sunday, hammering the region with fist-sized hail, blinding rain and tornadoes, including a half-mile wide twister that struck near Oklahoma City. News reports said at least one person had died. REUTERS/Gene Blevins ( -USA-OKLAHOMA-TORNADO/ )

A semi-tractor trailer (top) rests on its side against the guard rails on Interstate 40 as another trailer lies broken open on the road below after falling from I-40, following a tornado strike near Highway 177 north of Shawnee, Oklahoma May 19, 2013. A tornado half a mile wide struck near Oklahoma City on Sunday, part of a massive storm front that hammered the central United States. News reports said at least one person had died. REUTERS/Bill Waugh ( USA-OKLAHOMA/TORNADO )

Residents of Edmond, Okla., survey storm damage from a tornado that hit their neighborhood Sunday, May 19, 2013. Forecasters had warned that the middle of the country would see severe weather throughout the weekend. (AP Photo/Sean Murphy) ( Severe Weather )

An official walks next to storm debris at a mobile home park which was destroyed by a tornado on Sunday, west of Shawnee, Oklahoma May 19, 2013. A tornado half a mile wide struck near Oklahoma City on Sunday, part of a massive storm front that hammered the central United States. News reports said at least one person had died. REUTERS/Bill Waugh ( USA-OKLAHOMA/TORNADO )

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 ( 519884305 )

Bob Cameron of Edmond, Oklahoma, helps a neighbor move downed trees after a tornado swept through the eastern part of Edmond, Oklahoma May 19, 2013. A tornado half a mile wide struck near Oklahoma City on Sunday, part of a massive storm front that hammered the central United States. News reports said at least one person had died. REUTERS/Bill Waugh ( USA-OKLAHOMA/TORNADO )

An aerial view of the damage in the aftermath of tornadoes that touched down near Shawnee Twin Lakes, Oklahoma May 19, 2013, in this still image provided by KFOR-TV. A tornado half a mile wide struck near Oklahoma City on Sunday, part of a massive storm front that hammered the central United States. News reports said at least one person had died. Courtesy of KFOR-TV/Handout via Reuters ( USA-OKLAHOMA/TORNADO )

June McFarland reacts to the first sight of storm damage in rural Osage, Iowa on Sunday, May 19, 2013. A powerful weather system moved through the area on Sunday afternoon triggering tornado warnings, high winds and hail. (AP Photo/The Globe Gazette, Arian Schuessler) ( Severe Weather )

This imaged obtained courtesy of KFOR-TV shows damaged structures on May 19, 2013 after a tornado ripped through Wellston, Oklahoma. Tornadoes damaged many areas across the state May 19, 2013 and are still forming. Homes have been destroyed, with the worst damage so far just outside of Wellston. AFP PHOTO / KFOR-TV ( 519882731 )

A barn's roof and siding is torn off after a tornado swept through west of Shawnee, Oklahoma on May 19, 2013. A tornado half a mile wide struck near Oklahoma City on Sunday, part of a massive storm front that hammered the central United States. News reports said at least one person had died. REUTERS/Bill Waugh ( USA-OKLAHOMA/TORNADO )

People survey damage from a tornado that hit Edmond, Okla., on Sunday, May 19, 2013. A powerful storm system rumbled through the Plains and upper Midwest on Sunday, spawning tornadoes that damaged roofs and structures near Oklahoma City and kicked up debris in Wichita, Kan. (AP Photo/Sean Murphy) ( Severe Weather )

An aerial view of the damage in the aftermath of tornadoes that touched down near Shawnee Twin Lakes, Oklahoma May 19, 2013, in this still image provided by KFOR-TV. A tornado half a mile wide struck near Oklahoma City on Sunday, part of a massive storm front that hammered the central United States. News reports said at least one person had died. Courtesy of KFOR-TV/Handout via Reuters ( USA-OKLAHOMA/TORNADO )

Friends and neighbors help out a resident in Lyon County just south of Emporia, Kan., Sunday evening, May 19, 2013 after an apparent tornado touched down. (AP Photo/Emporia Gazette, Matthew Fowler) ( Severe Weather )

A tornado caused extensive damage along I-40 at the junction with US 177 on the west side of Shawnee, Okla., Sunday evening, May 19, 2013. (AP Photo/The Oklahoman, Jim Beckel) ( Oklahoma Tornadoes )

Residents help repair the roof of their neighbour's house which was damaged by a fallen tree when a tornado swept through Shawnee, in Oklahoma May 19, 2013. A massive storm front swept north through the central United States on Sunday, hammering the region with fist-sized hail, blinding rain and tornadoes, including a half-mile wide twister that struck near Oklahoma City. News reports said at least one person had died. REUTERS/Gene Blevins ( USA-OKLAHOMA/TORNADO )

Alli Christian, left, helps Jessica Wilkinson as she looks for her dog Bella after Wilkinson returned to find her home near 156th street and Franklin Road destroyed by a tornado on Sunday, May 19, 2013 in Norman, Okla. (AP Photo/The Oklahoman, Steve Sisney) ( Severe Weather )

A tornadic thunderstorm passes over Clearwater, in Kansas May 19, 2013. A massive storm front swept north through the central United States on Sunday, hammering the region with fist-sized hail, blinding rain and tornadoes, including a half-mile wide twister that struck near Oklahoma City. News reports said at least one person had died. REUTERS/Gene Blevins ( USA-OKLAHOMA-TORNADO/ )

A damaged mobile home is pictured amid the debris after a tornado swept through Shawnee, in Oklahoma May 19, 2013. A massive storm front swept north through the central United States on Sunday, hammering the region with fist-sized hail, blinding rain and tornadoes, including a half-mile wide twister that struck near Oklahoma City. News reports said at least one person had died. REUTERS/Gene Blevins ( USA-OKLAHOMA-TORNADO/ )

A tornado is pictured near a home in South Haven, Kansas May 19, 2013. A massive storm front swept north through the central United States on Sunday, hammering the region with fist-sized hail, blinding rain and tornadoes, including a half-mile wide twister that struck near Oklahoma City. News reports said at least one person had died. REUTERS/Gene Blevins ( USA-OKLAHOMA-TORNADO/ )

Lightning from a tornadic thunderstorm passing over Clearwater, Kansas strikes near storm chasers May 19, 2013. A massive storm front swept north through the central United States on Sunday, hammering the region with fist-sized hail, blinding rain and tornadoes, including a half-mile wide twister that struck near Oklahoma City. News reports said at least one person had died. REUTERS/Gene Blevins ( USA-OKLAHOMA-TORNADO/ )

A destroyed truck being blown off the 40 freeway is pictured with its damaged cargo after a tornado swept through Shawnee, in Oklahoma May 19, 2013. A massive storm front swept north through the central United States on Sunday, hammering the region with fist-sized hail, blinding rain and tornadoes, including a half-mile wide twister that struck near Oklahoma City. News reports said at least one person had died. REUTERS/Gene Blevins ( USA-OKLAHOMA-TORNADO/ )

A destroyed truck being blown off the 40 freeway is pictured with its damaged cargo after a tornado swept through Shawnee, in Oklahoma May 19, 2013. A massive storm front swept north through the central United States on Sunday, hammering the region with fist-sized hail, blinding rain and tornadoes, including a half-mile wide twister that struck near Oklahoma City. News reports said at least one person had died. REUTERS/Gene Blevins ( USA-OKLAHOMA-TORNADO/ )

Storm chasers get close to a tornadic thunderstorm, one of several tornadoes that touched down, in South Haven, Kansas, May 19, 2013. A massive storm front swept north through the central United States on Sunday, hammering the region with fist-sized hail, blinding rain and tornadoes, including a half-mile wide twister that struck near Oklahoma City. News reports said at least one person had died. REUTERS/Gene Blevins ( USA-OKLAHOMA-TORNADO/ )

Residents help repair the roof of their neighbour's house which was damaged by a fallen tree when a tornado swept through Shawnee, in Oklahoma May 19, 2013. A massive storm front swept north through the central United States on Sunday, hammering the region with fist-sized hail, blinding rain and tornadoes, including a half-mile wide twister that struck near Oklahoma City. News reports said at least one person had died. REUTERS/Gene Blevins ( USA-OKLAHOMA/TORNADO )

Marlena Hodson walks out of her home as her grandsons, Campbell Miller, 10, and Dillon Miller, 13, at right, help her sort through belongings after a tornado damaged her home Carney Okla., on Sunday, May 19, 2013. Hodson and her family left the home to escape the tornado. (AP Photo/The Oklahoman, Bryan Terry) ( Severe Weather )

Alli Christian, left, returns Jessica Wilkinson's dog Bella to her after finding her among the wreckage of Wilkinson's home shortly after a tornado struck near 156th street and Franklin Road on Sunday, May 19, 2013 in Norman, Okla. No one was in the home when the storm struck. (AP Photo/The Oklahoman, Steve Sisney) ( Severe Weather )

Debris is scattered in what was a mobile home park where a tornado struck near Dale, Okla., Sunday, May 19, 2013. (AP Photo Sue Ogrocki) ( Severe Weather )

A flag flies in the debris of a mobile home after a tornado struck a mobile home park near Dale, Okla., Sunday, May 19, 2013. (AP Photo Sue Ogrocki) ( Severe Weather )