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This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch) ( Severe Weather )

In this Feb. 2, 2011 file photo, hundreds of cars are seen stranded on Lake Shore Drive in Chicago. Global warming is rapidly turning America the beautiful into America the stormy, sneezy and dangerous, according to a new U.S. federal scientific report released Tuesday, May 6, 2014. (AP Photo/Kiichiro Sato) ( Climate Report )

In this Aug. 3, 2011 file photo, Texas State Park police officer Thomas Bigham walks across the cracked lake bed of O.C. Fisher Lake in San Angelo, Texas. (AP Photo/Tony Gutierrez) ( Climate Report )

In this Oct. 30, 2012 file photo, a parking lot full of yellow cabs in Hoboken, N.J. is flooded as a result of Superstorm Sandy. (AP Photo/Charles Sykes, File) ( Climate Report )

A debris trail, bottom, left when a tornado struck a Vilonia, Ark., neighborhood, leads from the rows of houses Monday, April 28, 2014, after a tornado struck the town late Sunday, killing at least 16 people. (AP Photo/Danny Johnston) ( Severe Weather )

In this Oct. 30, 2011 file photo, a man walks near a tree down on a power line a day after a snow storm in Glastonbury, Conn. (AP Photo/Jessica Hill, File) ( Climate Report )

This Oct. 14, 2011 photo shows Mountain Pine Beetle larvae that live inside whitebark pines, feeding on tree tissue that carries water and nutrients in Twisp, Wash. (AP Photo/The Seattle Times, Steve Ringman) ( Climate Report )

The Big Thompson River rages through the washed out Loveland Water Storage Reservoir in Larimer County Colorado Saturday morning, September 14, 2013. (Photo By Andy Cross/The Denver Post) ( CD15HELIFLOOD_14972 )

A wildfire burns in the hills just north of the San Gabriel Valley community of Glendora, Calif. on Thursday, Jan 16, 2014. (AP Photo/Nick Ut) ( Climate Report )

A fire truck drives past trees burned during the Las Conchas fire in Los Alamos, N.M., Thursday, June 30, 2011. (AP Photo/Jae C. Hong) ( Climate Report )

In this Dec. 8, 2011 file photo, Marco Pinchot, of Taylor Shellfish Farms, checks a Totten Virginica oyster during a transplant operation on the waters of Oyster Bay in the Totten Inlet near Shelton, Wash. Oyster growers in Washington state are among those observing climate-related changes that are outside of recent experience, according to the National Climate Assessment report released Tuesday, May 6, 2014. (AP Photo/Ted S. Warren, File) ( Climate Report )

Wildfire smoke masks the sun as it sets over a ridge Saturday, June 22, 2013, near South Fork, Colo. (AP Photo/Gregory Bull) ( Climate Report )

In this May 1, 2014 file photo, Marine unit police officer Robert Jonah walks through flood waters from the Schuylkill River on Main Street, Thursday, May 1, 2014, in the Manayunk neighborhood of Philadelphia. (AP Photo/Matt Rourke) ( Climate Report )

Arkansas National Guard Staff Sgt. Skipper Smith hangs an American flag on a pole at the site of a home that was destroyed when a tornado hit the area April 29, 2014 in Vilonia, Arkansas. (Photo by Mark Wilson/Getty Images) ( 487308107 )

This Feb. 7, 2014, file photo shows the cracked-dry bed of the Almaden Reservoir in San Jose, Calif. (AP Photo/Marcio Jose Sanchez, File) ( Climate Report )

Casey Roy, 9, looks through an outside window at the damage in her families basement, at Premier Place in north Boulder, flood water was about three-feet in the basement, September 12, 2013. (Photo By RJ Sangosti/The Denver Post) ( FLOODING_RJ22084 )

In this Aug. 25, 2013, file photo, inmate firefighters walk along Highway 120 after a burnout operation as firefighters continue to battle the Rim Fire near Yosemite National Park, Calif. (AP Photo/Jae C. Hong, File) ( Climate Report Southwest )

This Oct. 31, 2012 aerial file photo shows destruction in the wake of Superstorm Sandy in Seaside Heights, N.J. (AP Photo/Mike Groll, File) ( Climate Report )

In this Aug. 24, 1992 file photo, a sailboat sits on a sidewalk at Dinner Key in Miami after it was washed ashore by Hurricane Andrew. (AP Photo/Terry Renna, File) ( Climate Report )

Destiny Simmons sits in the rubble of her home that was destroyed by a tornado as she talks on a cell phone, Monday, April 28, 2014, in Vilonia, Ark. (AP Photo/Eric Gay) ( Severe Storms )

A house is fully engulfed with flames in the midst of the Black Forest Fire northeast of Colorado Springs on June 12, 2013. . Photo by Helen H. Richardson/The Denver Post) ( CD12BLACKFORESTFIRE__HHR8821 )

In this June 27, 2011 file photo, floodwaters from the Souris River surround homes near Minot State University in Minot, N.D. (AP Photo/Charles Rex Arbogast) ( Climate Report )

This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch) ( Severe Weather )

In this April 19, 2011 file photo, a wildfire threatens a house near Possum Kingdom, Texas. (AP Photo/LM Otero) ( Climate Report )

n this May 30, 2013, file photo, water splashes over the Center Street Dam in the swollen Des Moines River in downtown Des Moines, Iowa. (AP Photo/Charlie Neibergall, File) ( Climate Report )

Damage from the east edge of the Black Forest Fire Colorado Springs, Colorado. June 13, 2013 Denver, Colorado Springs. (Photo By Joe Amon/The Denver Post) ( CD13BLACKFORESTFIRE_JA13394 )

In this July 16, 2013 file photo, roofer Juan Belis sweats as he works in the midday heat atop a building, in Philadelphia. (AP Photo/Matt Rourke) ( Climate Report )

In this Aug. 3, 2011 file photo, the remains of a carp is seen on the lake dried out lake bed of O.C. Fisher Lake in San Angelo, Texas. (AP Photo/Tony Gutierrez) ( Climate Report )

In this Oct. 29, 2012 file photo, sea water floods the World Trade Center construction site in New York during Superstorm Sandy. (AP Photo/John Minchillo, File) ( Climate Report )

A wall of dark smoke looms large over the horizon as fire destroys the landscape looking south from Mountain Dance Drive and Open Sky Way northeast of Colorado Srpings, CO on June 11, 2013. Photo by Helen H. Richardson/The Denver Post) ( CD12BLACKFORESTFIRE_HHR_6264 )

A concrete slab and rubble are all that is left of a home in Vilonia, Ark., neighborhood Monday, April 28, 2014, after a tornado struck the town late Sunday. (AP Photo/Danny Johnston) ( Severe Weather )

In this Dec. 8, 2011 file photo, Dammon Saunders, a deckhand with Taylor Shellfish Farms, reaches for a container as he transplants Totten Virginica oysters, on the waters of Oyster Bay in the Totten Inlet near Shelton, Wash. Oyster growers in Washington state are among those observing climate-related changes that are outside of recent experience, according to the National Climate Assessment report released Tuesday, May 6, 2014. (AP Photo/Ted S. Warren, File) ( Climate Report )

Some residents were allowed back to see their homes that were burned in the Black Forest Fire area near Colorado Springs, Colorado. June 19, 2013 Colorado Springs. (Photo By Joe Amon/The Denver Post) ( CD17BLACKFORESTFIRE_JA15151 )

In this Wednesday April 30, 2014 file photo, a man walks near a portion of the Scenic Highway collapsed near Pensacola, Fla. (AP Photo/Pensacola News Journal, Katie E. King, File) ( Climate Report )

This Aug. 30, 2011 file aerial photograph shows destruction of Route 4 in Killington, Vt., after Tropical Storm Irene passed through New England. Global warming is rapidly turning America into a stormy and dangerous place, with rising seas and disasters upending lives from flood-stricken Florida to the wildfire-ravaged West, according to a new U.S. federal scientific report released Tuesday, May 6, 2014. (AP Photo/Toby Talbot, File) ( Climate Report )

In this May 10, 2010 photo, an oil facility stands past dead trees on Isle de Jean Charles, La. (AP Photo/Patrick Semansky, File) ( Climate Report )

This Oct. 14, 2011 photo shows damaged pine trees from Bark Beatles in the Sawtooth Ridge area above the Methow Valley in the North Cascades, Wash. The beetles are whittling away at high-elevation trees once thought mostly safe from bugs. (AP Photo/The Seattle Times, Steve Ringman) ( Climate Report )

A woman carries her child through a field near the collapsed Plaza Towers Elementary School in Moore, Okla., Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki) ( APTOPIX Severe Weather )

Lightning strikes during a thunder storm as tornado survivors search for salvagable stuffs at their devastated home on May 23, 2013, in Moore, Oklahoma. Severe thunderstorms barreled through this Oklahoma City suburb at dawn Thursday, complicating clean-up efforts three days after a powerful tornado killed 24 people and destroyed 2,400 homes. More rain was forecast to fall on Moore, soaking the disaster zone where residents had just the day before, under clear blue skies, started picking through the rubble of their destroyed houses to recover personal effects. JEWEL SAMAD/AFP/Getty Images ( 520002437 )