Environment

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Residents walk along a street in Tupelo, Miss., Monday, April 28, 2014. 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/The Daily Mississippian, Thomas Graning)

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Esmeralda, left and Craig Stanford help a friend clean up his North Gloster Street Texaco gas station and quick stop in Tupelo, Miss, after a tornado touched down on Monday, April 28, 2014. (AP Photo/Jim Lytle)

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A building is damaged in Tupelo, Miss. Monday, April 28, 2014. 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/The Daily Mississippian, Ignacio Murillo)

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A building is damaged in Tupelo, Miss. Monday, April 28, 2014. 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/The Daily Mississippian, Ignacio Murillo)

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A building is damaged in Tupelo, Miss. Monday, April 28, 2014. 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/The Daily Mississippian, Ignacio Murillo)

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Buildings are damaged along Gloucester Street after a tornado in Tupelo, Miss., Monday, April 28, 2014.T ornados 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/The Daily Mississippian, Thomas Graning)

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Buildings are damaged along Gloucester Street after a tornado in Tupelo, Miss., Monday, April 28, 2014.T ornados 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/The Daily Mississippian, Thomas Graning)

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Ambulances gather outside the Winston Medical Center in Louisville, Miss., Monday, April 28, 2014 after a tornado hit the small hospital as well as several homes in the community. At least three tornados flattened homes and businesses, flipped trucks over on highways and injured numerous people in Mississippi and Alabama as a massive, dangerous storm system passed over several states in the South. (AP Photo/Rogelio V. Solis)

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Buildings are damaged along Gloucester Street after a tornado in Tupelo, Miss., Monday, April 28, 2014. 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/The Daily Mississippian, Thomas Graning)