derives from cirrus homogenitus cloud homomutatus cloud Once these clouds resemble natural cirri-form clouds (Cirrus, Cirrocumulus, Cirrostratus), they are classified as such. An aeroform which is formed as a result of strong upper winds spreading a cirrus homogenitus cloud in the atmosphere and, in turn, causing internal tranformations which result in the cloud taking on the appearnce of natural cirri-form clouds. envoAtmo water-based cloud