Environment

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Friends and family sift through debris at the home of Daniel Wassom after is was destroyed by a tornado, Monday, April 28, 2014, in Vilonia, Ark. Wassom died in the tornado trying to shield a family member. (AP Photo/Eric Gay)

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Teresa Ingram finds a photo album of her daughter's as she looks for belongings after a tornado passed through destroying Billy Barbs mobile home park on Tuesday, April 29, 2014, in Athens, Ala. A dangerous storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark Tuesday morning. (AP Photo/Butch Dill)

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Sandy Robinson works to salvage drinks from a damaged Shell gas station on North Gloster Street in Tupelo, Miss., Tuesday, April 29, 2014. A dangerous storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark Tuesday morning. (AP Photo/Thomas Graning)

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Stacy Sanders carries materials from his destroyed business on North Gloster Street in Tupelo, Miss., Tuesday, April 29, 2014. A dangerous storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark Tuesday morning. (AP Photo/Thomas Graning)

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An American flag rests on a pillar as damaged buildings are seen in the background on North Gloster Street in Tupelo, Miss., Tuesday, April 29, 2014. A dangerous storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark Tuesday morning. (AP Photo/Thomas Graning)

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In this April 27, 2014 photo, a display box is seen on a solar-powered picnic table at the campus of Southern Illinois University in Carbondale. The table collects solar rays and allow students to use that energy to charge electronic devices. The Solar Dok table is made of recyclable plastics. It's equipped with an umbrella, four seats, a solar array, a 110-volt charger, the display box and two USB ports. (AP Photo/The Southern, Adam Testa)

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This April 27, 2014 photo shows a solar-powered picnic table near the Life Sciences building and greenhouse at the Southern Illinois University campus in Carbondale. The table collects solar rays and allow students to use that energy to charge electronic devices. The Solar Dok table is made of recyclable plastics. It's equipped with an umbrella, four seats, a solar array, a 110-volt charger, a display box and two USB ports. (AP Photo/The Southern, Adam Testa)

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A volunteer joins a first responder as they jog toward other ambulances that are gathering outside the Winston Medical Center in Louisville, Miss., Monday, April 28, 2014 after a tornado hit the small hospital, a nursing home next door and a number of homes and businesses in the east Mississippi community. Tornados flattened homes and businesses, flipped trucks over on highways and injured numerous people in Mississippi and Alabama on Monday as a massive, dangerous storm system passed over several states in the South, threatening additional twisters as well as severe thunderstorms, damaging hail and flash floods. (AP Photo/Rogelio V. Solis)

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Raella Faulkner, at left, and Bobby McElroy survey what's left of their home Monday, April 28, 2014 after a tornado struck the town of Vilonia, Ark. late Sunday. The couple rode out the storm safely in a nearby storm shelter. Vilonia was hit hard Sunday after a tornado system ripped through several states in the central U.S. and left more than a dozen dead in a violent start to this year's storm season, officials said. (AP Photo/Karen E. Segrave)

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A police officer directs traffic in front of damaged homes on Clayton Avenue in Tupelo, Miss., Tuesday, April 29, 2014. A dangerous storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark Tuesday. (AP Photo/Thomas Graning)

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Kevin Barnes searches the remains of his home on Clayton Avenue in Tupelo, Miss., Tuesday, April 29, 2014. A dangerous storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark Tuesday. (AP Photo/Thomas Graning)

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A resident searches the remains of his home on Clayton Avenue in Tupelo, Miss., Tuesday, April 29, 2014. A dangerous storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark Tuesday. (AP Photo/Thomas Graning)

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Mark Wade searches for personal items after his home was destroyed by Sunday's tornado, Tuesday, April 29, 2014, in Vilonia, Ark. A dangerous storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark Tuesday morning. (AP Photo/Eric Gay)

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Debris is scattered along with destroyed mobile homes at Billy Barbs mobile home park on Tuesday, April 29, 2014, in Athens, Ala. A dangerous storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark Tuesday morning. (AP Photo/Butch Dill)