Abstract
The cirrus uncinus cloud is considered to be a trail of ice crystals released from the mothercloud. In the present paper a theoretical and observational study was made to determine the influencing factors related to the characteristic shape of the clouds. The shape of the clouds was numerically computed under reasonable conditions of temperature, humidity and wind velocity based, on observational data.
As a result of the computation, it was found that the shape of cirrus uncinus clouds depended on the mass of cirrus uncinus cloud particles and on the vertical wind shear at the cloud level, however it was found that the shape of the clouds did not generally depend on the type of cirrus uncinus cloud particles except in the case of needle type particles with large axial ratios.
