Cloud (Defined)

1. a visible mass of particles of condensed vapor (as water or ice) suspended in the atmosphere of a planet (as the earth) or moon. 2. any similar mass, especially of smoke or dust.--By Leanne Burden Seidel
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Clouds cover the sky as tourists walk down from the top of the Sydney Harbour Bridge on February 21. (Saeed Khan/AFP/Getty Images)
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A blue sky and white clouds are reflected in a street mirror in Frankfurt, Germany, March 2. (Michael Probst/Associated Press)
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A mushroom cloud in the sky after a car bomb exploded in eastern Mosul, during an ongoing military operation against Islamic State (IS) group militants. (DIMITAR DILKOFF/AFP/Getty Images)
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Storm clouds frame the iconic landmark El Panecillo in the heart of downtown, in Quito, Ecuador, March 8. (Dolores Ochoa/Associated Press)
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Colima volcano spews a cloud of ash near Carrizalillos, Mexico, Jan. 25. (Ulises Ruiz Basurto/EPA)
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An Air Canada plane flies underneath dark clouds illuminated by some sun rays above Frankfurt, Germany, March 2. (Frank Rumpenhorst/dpa via AP)
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Lightning flashes in storm clouds over the village of Dunlap, Ill., Feb. 28. A spring-like storm churning across the Midwest poses a risk of more bad weather for millions of people. (Ron Johnson/Journal Star via AP)
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Dramatic clouds still lurk in Laguna Beach, Calif., after several days of powerful winter storms, Jan. 24. (Mindy SchauerThe Orange County Register via AP)
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Clouds drift past the nocturnal skyline of Frankfurt am Main, western Germany, on Feb. 23. (FRANK RUMPENHORST/AFP/Getty Images)
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Clouds of steam flows across the sky in the early morning from the Kendall Cogeneration Station in Cambridge. (David L. Ryan/Globe Staff)
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An almost full moon is surrounded by clouds in Frankfurt, Germany, March 10. (Michael Probst/Associated Press)
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A family hikes along Mule Deer Trail on a sunny afternoon in Thomas F. Riley Wilderness Park in Coto De Caza in San Juan Capistrano, Calif. (Mark Righmire/The Orange County Register via AP)
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Smoke rises from a wildfire on March 19, in Boulder, Colo. (Seth Frankel/Associated Press)
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Clouds are reflected in the glass facade of the Time Warner building in New York. (Mark Lennihan/Associated)
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Light shines through fog and black clouds over the Swiss Alps. (FABRICE COFFRINI/AFP/Getty Images)
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The sun rises over the clouds in front of the summit of Haleakala volcano in Haleakala National Park on Hawaii’s island of Maui, Jan. 22. (Caleb Jones/Associated Press)
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Smoke billows from the Mt. Etna’s volcano, near Catania, in Sicily, southern Italy, March 16. (Salvatore Allegra/Associated Press)
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A cloud in the sky over Palma Majorca, Spain, March 7. The Balearic Islands will experience springlike temperatures with clear skies during the next days. (Cati Cladera/EPA)
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The Colima or Fuego volcano spews ash and smoke on Jan. 23, as seen from San Antonio, Colima State, Mexico. (HECTOR GUERRERO/AFP/Getty Images)
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Two girls are silhouetted under low cloud while walking along a breakwater in Powell River, British Columbia, March 16. (Darryl Dyck/The Canadian Press via AP)
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Low clouds blanket the horizon during a race inspection of a women’s downhill at the alpine ski World Championships, in St. Moritz, Switzerland, Feb. 9. (Alessandro Trovati/Associated Press)
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Clouds pass over the Apostolic palace as Pope Francis delivers the Angelus prayer from his studio’s window overlooking St. Peter’s Square at the Vatican, March 5. (Gregorio Borgia/Associated Press)
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One World Trade Center, top left, and other New York and New Jersey buildings are seen under low hanging clouds lit up with the rising sun, Jan. 5 in Jersey City, N.J. (Julio Cortez/Associated Press)
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The Tornado steam locomotive pulls the first timetabled main line steam-hauled service for half a century across the Ribblehead viaduct in North Yorkshire. on February 14 in Appleby, England. (Christopher Furlong/Getty Images)
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Rain clouds sit over McLean Park as rain delays the start of the 2nd one-day international cricket match between New Zealand and Australia at McLean Park in Napier on February 2. (MARTY MELVILLE/AFP/Getty Images)
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Lightning bolts light up the sky near the world’s tallest building, the Burj Khalifa, in Dubai, United Arab Emirates, March 25. (Jon Gambrell/Associated Press)
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Steam rises into the sky from the cooling tower of the German nuclear power plant ‘Isar’ (KKI) near Essenbach, southern Germany, March 16. (CHRISTIAN BRUNA/EPA)
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A broad tornado capable of leaving “catastrophic” damage in its wake churned across the Oklahoma landscape. (Hayden Mahan via AP)
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A nearly full moon is flanked by clouds as it rises near the Insurance Building in Olympia, Wash. (Ted S. Warren/Associated Press)
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Boats sit docked in front of the MIT Sailing Pavilion as clouds hang over Boston. (Keith Bedford/Globe Staff)
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Scattered clouds dot the sky at sunrise as surfers make their way to the water south of the Huntington Beach Pier, a day after storms pounded Orange County in Huntington Beach, Calif. (Mark Rightmire /The Orange County Register via AP)
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Buildings are seen on a polluted day in Beijing. China’s capital city started the year under a heavy blanket of grey smog, with a concentration of toxic particles 20 times higher than the maximal level recommended by the World Health Organization, as a new pollution cloud was - again - striking the country. (GREG BAKER/AFP/Getty Images)
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Clouds are mirrored in a floated meadow in Ruderatshofen, southern Germany, March 10. (Karl-Josef Hildenbrand/dpa via AP)
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Tampa Bay Rays pitcher Chih-Wei Hu, of Taiwan, warms up as storm clouds pass after a rain shower at a spring training baseball workout in Port Charlotte, Fla. on Feb 22. (David Goldman/Associated Press)
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