Hot air balloon sea level, and humidity of the air surrounding. On a warm day, a balloon cannot lift as much as on a cool day, because the temperature required for launch will exceed the maximum sustainable for nylon envelope fabric. Also, in the lower atmosphere, the lift provided by a hot air balloon decreases about 3% for each 1,000 meters (1% per 1,000 ft) of altitude gained. Standard hot air balloons are known as Montgolfier balloons and rely solely on the buoyancy of hot air provided by the burner and contained by the envelope. This style of balloon was developed by the
Alabama Jubilee Hot Air Balloon Classic Classic consists of three different balloon events: The Alabama Jubilee Hot-Air Balloon Classic, one of the oldest hot-air balloon races in the mid-South, started in Decatur, AL in 1978 with competition among 17 balloonists from Alabama, Kentucky, Ohio, Georgia, Mississippi and Louisiana. It was a showcase for the new Decatur balloon, one of the first to represent a city, and an event to kick off Alabama's tourism season. The Jubilee now draws about 60 pilots from 20 states for two days of friendly competition during the annual Memorial Day holiday weekend. The continued popularity of the Alabama Jubilee prompted the