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People enter a community storm shelter during a tornado watch in Tuscaloosa, Ala., on in this image taken from video, Tuesday, April 29, 2014. Hundreds of people sought refuge in structures built after the 2011 tornado outbreak during the most recent wave of severe weather to hit the state. (AP Photo/Jay Reeves)

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ADVANCE FOR SATURDAY, MAY 3 AND THEREAFTER - In a Tuesday, April 22, 2014 photo, kayakers paddle out for a tour of Sweet Marsh near Tripoli, Iowa. The 3,000-acre wildlife area contains multiple habitats ideal for a variety of species. (AP Photo/Waterloo Courier, Brandon Pollock)

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ADVANCE FOR SATURDAY, MAY 3 AND THEREAFTER - In a Tuesday, April 22, 2014 photo, pelicans take flight at Sweet Marsh near Tripoli, Iowa. Kayakers tour Sweet Marsh to see the variety of waterfowl that come by there. The 3,000-acre wildlife area contains multiple habitats ideal for a variety of species. (AP Photo/Waterloo Courier, Brandon Pollock)

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ADVANCE FOR SATURDAY, MAY 3 AND THEREAFTER - In a Tuesday, April 22, 2014 photo, Marge Schaffer, of Waverly, reassembles her paddle after navigating through the reeds at Sweet Marsh near Tripoli, Iowa. The 3,000-acre wildlife area contains multiple habitats ideal for a variety of species. (AP Photo/Waterloo Courier, Brandon Pollock)

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ADVANCE FOR SATURDAY, MAY 3 AND THEREAFTER - In a Tuesday, April 22, 2014 photo, paddlers head back to the landing at the end of a tour Sweet Marsh near Tripoli, Iowa, with Crawdaddy Outdoors. The 3,000-acre wildlife area contains multiple habitats ideal for a variety of species. (AP Photo/Waterloo Courier, Brandon Pollock)

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A dozer pushes storm debris in Vilonia, Ark., Thursday, May 1, 2014, in the wake of a tornado that struck the town late Sunday. Forecasters say a tornado that hit Little Rock's suburbs and killed 15 people had winds approaching 200 mph. Sunday's storm was rated as a "high-end" EF4 on a scale of tornado strength. (AP Photo/Danny Johnston)

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Rebecca Goodman makes a flower out of clay during a Plant and Soil Science class at Beech Grove High School Wednesday, April 30, 2014, in Indianapolis. High school agriculture programs sprouting across the nation’s Corn Belt are teaching teenagers, many of them in urban environments, that careers in the field often have nothing to do with cows and plows. (AP Photo/Darron Cummings)

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Chase Martin, left, and Harley Brown work with teacher Chris Kaufman on a project during Plant and Soil Science class at Beech Grove High School Wednesday, April 30, 2014, in Indianapolis. High school agriculture programs sprouting across the nation’s Corn Belt are teaching teenagers, many of them in urban environments, that careers in the field often have nothing to do with cows and plows. (AP Photo/Darron Cummings)