Environment

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AP10thingsToSee - Residents and friends sift through debris after a tornado struck the area, Monday, April 28, 2014, in Vilonia, Ark. A dangerous storm system spawned a chain of deadly tornadoes over three days. (AP Photo/Eric Gay)

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A truck drives along a still-flooded section of Bayliss Court as Gulf Coast residents continue cleaning up from damage caused by torrential rains in Pensacola, Fla., Thursday, May 1, 2014. At the Pensacola airport, 15.55 inches (39.5 centimeters) of rain fell on Tuesday before midnight, setting a record for the rainiest single day in the city. (AP Photo/G.M. Andrews)

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A older model car shows the evidence of receding floodwaters as Gulf Coast residents continue cleaning up from damage caused by torrential rains in Pensacola, Fla., Thursday, May 1, 2014. At the Pensacola airport, 15.55 inches (39.5 centimeters) of rain fell on Tuesday before midnight, setting a record for the rainiest single day in the city. (AP Photo/G.M. Andrews)

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Anthony Snyder rescues a chair and a floor jack from receding floodwaters in the backyard of his home as he and other Gulf Coast residents continue cleaning up from damage caused by torrential rains in Pensacola, Fla., Thursday, May 1, 2014. At the Pensacola airport, 15.55 inches (39.5 centimeters) of rain fell on Tuesday before midnight, setting a record for the rainiest single day in the city. (AP Photo/G.M. Andrews)

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Anthony Snyder contemplates his next move as he continues to salvage belongings from his home as he and other Gulf Coast residents continue cleaning up from damage caused by torrential rains in Pensacola, Fla., Thursday, May 1, 2014. At the Pensacola airport, 15.55 inches (39.5 centimeters) of rain fell on Tuesday before midnight, setting a record for the rainiest single day in the city. (AP Photo/G.M. Andrews)

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Anthony Snyder pours water from a container of his belongings as he salvages items from his home as he and other Gulf Coast residents continue cleaning up from damage caused by torrential rains in Pensacola, Fla., Thursday, May 1, 2014. At the Pensacola airport, 15.55 inches (39.5 centimeters) of rain fell on Tuesday before midnight, setting a record for the rainiest single day in the city. (AP Photo/G.M. Andrews)

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Anthony Snyder rescues a chair and a floor jack from receding floodwaters in the backyard of his home as he and other Gulf Coast residents continue cleaning up from damage caused by torrential rains in Pensacola, Fla., Thursday, May 1, 2014. At the Pensacola airport, 15.55 inches (39.5 centimeters) of rain fell on Tuesday before midnight, setting a record for the rainiest single day in the city. (AP Photo/G.M. Andrews)

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Volunteer, Mark Weaver helps a Winston County, Miss. homeowner (not Pictured) cut up pine trees on Thursday, May 1, 2014. The trees were downed by a tornado on Monday. The National Weather Service has rated the tornado an EF-4. (AP Photo/Jim Lytle)

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Volunteer, Mark Weaver counts the rings on a 47 year-old pine tree on Thursday, May 1, 2014 in Winston County, Miss. The tree were downed by a tornado on Monday. The National Weather Service has rated the tornado an EF-4. (AP Photo/Jim Lytle)

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Area residents view autos sitting on top of each other in a washed out section of Dog Track Road in the Millview community as the Gulf Coast continues to clean up from damage caused by torrential rains in Pensacola, Fla., Thursday, May 1, 2014. The National Weather Service, estimated 15-20 inches of rain has fallen in the Pensacola area in the past 2 days. (AP Photo/G.M. Andrews)

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Autos sit on top of each other in a washed out section of Dog Track Road in the Millview community as Gulf Coast residents continue cleaning up from damage caused by torrential rains in Pensacola, Fla., Thursday, May 1, 2014. The National Weather Service, estimated 15-20 inches of rain has fallen in the Pensacola area in the past 2 days. (AP Photo/G.M. Andrews)

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A home remains in water despite receding flood waters, Thursday, May 1, 2014, in Gulf Breeze, Fla. The National Weather Service, estimated 15-20 inches of rain has fallen in the Pensacola area in the past 2 days. (AP Photo/John Raoux)

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Chelsea Owens navigates a kayak down a flooded street near her home in the Whisper Oaks subdivision, Thursday, May 1, 2014, in Gulf Breeze, Fla. The National Weather Service, estimated 15-20 inches of rain has fallen in the Pensacola area in the past 2 days. (AP Photo/John Raoux)

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A pickup truck remains overturned after flooding collapsed the driveway at this home in the Villa Venyce subdivision, Thursday, May 1, 2014, in Gulf Breeze, Fla. The National Weather Service, estimated 15-20 inches of rain has fallen in the Pensacola area in the past 2 days. (AP Photo/John Raoux)

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A young boy pedals his bike through a flooded street in the Whisper Lakes subdivision Thursday, May 1, 2014, in Gulf Breeze, Fla. The National Weather Service, estimated 15-20 inches of rain has fallen in the Pensacola area in the past 2 days. (AP Photo/John Raoux)

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Autos sit on top of each other in a washed out section of Dog Track Road in the Millview community as Gulf Coast residents continue cleaning up from damage caused by torrential rains in Pensacola, Fla., Thursday, May 1, 2014. The National Weather Service, estimated 15-20 inches of rain has fallen in the Pensacola area in the past 2 days. (AP Photo/G.M. Andrews)