Environment

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Piles of cars and the scattered remnants of homes and buildings are in a ditch in Vilonia, Ark., Monday, April 28, 2014 after a tornado struck the town late Sunday. 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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John Smith reacts after seeing what's left of his auto repair shop in Mayflower, Ark., Monday, April 28, 2014, after a tornado struck the town late Sunday. Mayflower 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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Police and fire officials search for survivors in what's left of a home on Cemetery Street in Vilonia, Ark., Monday, April 28, 201after a tornado struck the town late Sunday. 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 tornado's path is seen in an aerial photo made over Baxter Springs, Kan., Monday, April 28, 2014. A tornado damaged dozens of buildings and injured at least 25 people on Sunday. (AP Photo/Orlin Wagner)

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A tornado-damaged home is covered by tarps in Baxter Springs, Kan., Monday, April 28, 2014. The tornado left a trail of shattered homes, twisted metal and hanging power lines. One person died, but it was not clear whether the death was related to the storm. Volunteers were meeting early Monday to discuss cleanup efforts. Emergency officials say 60 to 70 homes and 20 to 25 businesses were destroyed or damaged in the town. (AP Photo/Orlin Wagner)

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The remains of a home damaged by a tornado Sunday evening stands in Baxter Springs, Kan., Monday, April 28, 2014. The tornado left a trail of shattered homes, twisted metal and hanging power lines. One person died, but it was not clear whether the death was related to the storm. Volunteers were meeting early Monday to discuss cleanup efforts. Emergency officials say 60 to 70 homes and 20 to 25 businesses were destroyed or damaged in the town. (AP Photo/Orlin Wagner)

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A piece of a pole hangs from a power line near tornado damage in Baxter Springs, Kan., Monday, April 28, 2014. The tornado left a trail of shattered homes, twisted metal and hanging power lines. One person died, but it was not clear whether the death was related to the storm. Volunteers were meeting early Monday to discuss cleanup efforts. Emergency officials say 60 to 70 homes and 20 to 25 businesses were destroyed or damaged in the town. (AP Photo/Orlin Wagner)