Annual Washington Post Bucket Event 2010

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Puffy streaks trail an aircraft over Washington, D.C. The contrails... News PhotoAir Vehicle,Artificial,Cloud - Sky,Condensation,Horizontal,Human Interest,USA,Vapor Trail,Washington DCPhotographer Collection: The Washington Post 2013 The Washington PostWASHINGTON, DC - APRIL 02: Puffy streaks trail an aircraft over Washington, D.C. The contrails (short for 'condensation trails') or vapor trails are the long thin artificial clouds that sometimes form behind aircraft. Their formation is usually triggered by the water vapor in the exhaust of aircraft engines. These were highlighted as the passenger plane headed west toward the direction of the sun in crisp cool skies. Photo by Michael S. Williamson/The Washington Post via Getty Images