A man sets fire to a pile of debris after a tornado near Vilonia, Arkansas May 1, 2014. Flood warnings were posted across the eastern United States on Thursday after a powerful storm system unleashed record amounts of rain from New England to Florida. The remnants of the storm that dumped up to 11 inches of rain in the Florida Panhandle on Wednesday had moved into the Atlantic Ocean by early Thursday, said Dan Petersen (not pictured), a National Weather Service meteorologist. (Photo by Carlo Allegri/Reuters)

A picture taken on May 3, 2014, shows people visiting “The Gateway to Hell”, a huge burning gas crater in the heart of Turkmenistan's Karakum desert. The fiery pit was the result of a simple miscalculation by Soviet scientists in 1971 after their boring equipment suddenly drilled through into an underground cavern and a deep sinkhole formed. Fearing that the crater would emit poisonous gases, the scientists took the decision to set it alight, thinking that the gas would burn out quickly and this would cause the flames to go out. But the flames have not gone out in more than 40 years, in a potent symbol of the vast gas reserves of Turkmenistan, which are believed to be the fourth largest in the world. (Photo by Igor Sasin/AFP Photo)

A street performer breathes fire on the eve of the feast day of the town's patron Saint Rita in Paranaque city, metro Manila, May 17, 2014. The annual feast day of Saint Rita is celebrated with colorful street dances and games on the third Sunday of May. (Photo by Romeo Ranoco/Reuters)

An Afghanistan National Army (ANA) soldier fires his weapon at the site of a clash between insurgents and security forces on the Indian Consulate in Herat, Afghanistan, Friday, May 23, 2014. Gunmen armed with machine guns and rocket-propelled grenades attacked the Indian Consulate in western Afghanistan's Herat province Friday, an assault that injured no diplomatic staff, police said. Indian officials said there had been a threat against its diplomats in Afghanistan, but gave no other details. (Photo by Hoshang Hashimi/AP Photo)

Molten steel is poared in the Metinvest Ilyich Iron and Steel Works on May 22, 2014 in Mariupol, Ukraine. Rinal Akhmetov, the owner of the factory and richest man in Ukraine has come out against pro-Russian separatists in eastern Ukraine ahead of Sunday's presidential election. (Photo by John Moore/Getty Images)

An Edmond firefighter looks on at a fire raging in a mobile home park during wildfires in Logan County, Okla., May 4, 2014. Firefighters worked through the night and into the early morning to battle the large wildfire that destroyed at least six homes, and left at least one person dead, after a controlled burn spread out of control in central Oklahoma. (Photo by Nate Billings/AP Photo/The Oklahoman)

A pro-Russian fighter takes a photo on his cell phone of a burning cafe after impact of a mortar bomb, during fighting between Ukrainian government troops and pro-Russian militants at a checkpoint near the major highway which links Kharkiv, outside Slovyansk, Ukraine, early Thursday, May 22, 2014. Three days before Ukraine holds a presidential vote, pro-Russia insurgents attacked a military checkpoint Thursday in eastern Ukraine, killing at least 11 troops and wounding 30 others in the deadliest raid yet in weeks of fighting. (Photo by Rafael Yaghobzadeh/AP Photo)

An elderly woman feeds a bonfire with newspapers at a barricade outside the occupied administration building in Donetsk, Ukraine, on May 23, 2014. (Photo by Evgeniy Maloletka/Associated Press)

Ultra-Orthodox Jews stand next to bonfires during Lag Ba'Omer celebrations to commemorate the end of a plague said to have decimated Jews in Roman times, in Bnei Brak, Israel, on May 17, 2014. (Photo by Oded Balilty/Associated Press)

Fireworks light the sky at the end of Victory Day celebrations in Odessa, Ukraine. In the Black Sea port, which last week was rocked by violent clashes between pro-Russian forces and supporters of the central government that left nearly 50 people died, the local governor issued an order banning public display of Russian flags. (Photo by Associated Press/Vadim Ghirda)

A wildfire burns near a home on Wednesday, May 14, 2014, in San Marcos, Calif. Flames engulfed suburban homes and shot up along canyon ridges in one of the worst of several blazes that broke out Wednesday in Southern California during a second day of a sweltering heat wave, taxing fire crews who fear the scattered fires mark only the beginning of a long wildfire season. (Photo by AP Photo)

A structure burns during a wildfire Thursday, May 15, 2014, in Escondido, Calif. One of the nine fires burning in San Diego County suddenly flared Thursday afternoon and burned close to homes, trigging thousands of new evacuation orders. (Photo by Gregory Bull/AP Photo)

A long exposure image of embers flying off burnt out trees following the wind driven wildfire ranging in the mountain area near Rancho Cucamonga late 30 April 2014. Earlier in the day more than 1,500 homes were evacuated as the Etiwanda fire charred around 1,000 acres in San Barnardino National Forest. (Photo by Stuart Palley/EPA)

A local resident rides a bicycle as other look at lames from a damaged gas pipe after an impact of a mortar bomb during fighting between Ukrainian government troops and pro-Russian militants, outside Slovyansk, eastern Ukraine, early Monday, May 19, 2014. Heavy mortar fire outside Slovyansk damaged a large gas pipeline and set off a fire. Slovyansk has been the epicenter of fighting between Ukrainian troops and pro-Russian insurgents, who have seized government buildings across the east. (Photo by Alexander Zemlianichenko/AP Photo)

A wildfire burns through a grove of Red Cedar trees as firefighters continued to work on containing the blaze on Monday, May 5, 2014, in Guthrie, Okla. Firefighters worked Monday to battle a large wildfire in central Oklahoma that destroyed at least six homes and left at least one person dead after a controlled burn spread out of control. (Photo by Nick Oxford/AP Photo)