Cirrus cloud tropopause prevents the warm, moist air forming the thunderstorm from rising any higher, thus creating the flat top. In the tropics, these thunderstorms occasionally produce copious amounts of cirrus from their anvils. High-altitude winds commonly push this dense mat out into an anvil shape that stretches downwind as much as several kilometers. Individual cirrus cloud formations can be the remnants of anvil clouds formed by thunderstorms. In the dissipating stage of a cumulonimbus cloud, when the normal column rising up to the anvil has evaporated or dissipated, the mat of cirrus in the anvil is all that is left. Contrails
Cloud swing stationary rig, with the swing itself hanging in a "V" shape. Generally, the motion provided to swing the performer is supplied by an assistant pulling on a tether at the bottom of the "V". "Cloud swing" is often performed at lower altitudes relative to "Mexican cloud swing". This is what distinguished "cloud swing" from "Mexican cloud swing". The cloud swing is a relatively new apparatus, and many of the figures performed on it are borrowed or adapted from static and swinging trapeze. Cloud swing The cloud swing (not to be confused with the Mexican cloud swing) is an aerial act