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Pileus clouds form when air at higher levels is forced to rise.
In the photograph below, a pileus cloud is attached to the top of a cumuliform cloud. The air that is lifted to form the pileus clouds is drier and consequently has a much higher lifting condensation level than does the moist air from lower levels often responsible for cumulus clouds . Therefore, there is little tendency for any significant vertical growth in pileus clouds, which is why the cloud takes on a smoother horizontal shape. Terms for using data resources. Credits and Acknowledgments for WW2010.