A rainbow forms over a wind-energy farm near Latham, Kan., on Thursday, May 8, 2014. The rainbow came from the tail end of a line of thunderstorms that reached from Minnesota to the Kansas and Oklahoma border. (Photo by Travis Heying/AP Photo/The Wichita Eagle)

Niagara Falls are seen with a double rainbow 8 October 2006 from aboard the Maid of the Mist on the Niagara River. Under the rainbow the American Falls can be seen. (Photo by Don Emmert/AFP Photo)

Twin rainbows appear over skyscrapers at sunset after Typhoon Neoguri passed through the region, in Tokyo July 11, 2014. (Photo by Issei Kato/Reuters)

Fans sit under the cover of an umbrella as a rainbow illuminates Coors Field as the Colorado Rockies face the Pittsburgh Pirates in Denver, on Jule 25, 2014. (Photo by Justin Edmonds/Getty Images)

Tourists view the Iguazu Falls from an observation platform at the Iguazu National Park near the southern Brazilian city of Foz do Iguacu June 16, 2014. Forming a border between Argentina and Brazil, the Iguazu Falls, South America's largest falls, attract more than 1 million visitors a year. (Photo by Jorge Adorno/Reuters)

A rainbow shines over a farm in Orland, California, as a severe storm brought funnel clouds and the report of a tornado touchdown in the area, on March 26, 2014. (Photo by Jason Halley/The Chico Enterprise-Record)

View of a damaged bridge at the Iguacu Falls on June 12, 2014, in Foz do Iguacu, Brazil, following the overflowing of the Parana river. In neighbouring Paraguay flooding has forced the evacuation of about 150,000 people in Paraguay's capital city Asuncion, authorities said. (Photo by Norberto Duarte/AFP Photo)

A rainbow is seen over the Yukon River in Eagle, Alaska in this undated handout photo courtesy of the U.S. Geological Society. (Photo by Reuters)

American League's Brian Dozier, of the Minnesota Twins, took the plate following a rain delay in the MLB All-Star baseball Home Run Derby, Monday, July 14, 2014, in Minneapolis. (Photo by Brian Mark Peterson/AP Photo/The Star Tribune)

Motorists traveling eastbound on Interstate 80 towards Chicago are treated to a brilliant rainbow as the sun sets and a storm clears Sunday, July 13, 2014, in La Salle County, Ill. (Photo by Charles Rex Arbogast/AP Photo)

A rainbow above St Peter's church in Nottingham after a sudden downpour, on August 29, 2012. (Photo by Lewis Stickley/PA Wire)