It is one of the vertical cloud, cloud depth can develop from the ground to thousands or tens of thousands of meters high. They are independent individuals, and their shapes can be large or small. The large one develops like hills or towers, with dense clouds. And the cloud bottom is relatively flat and neat, like a knife cut across, the appearance outline is obvious, the top of the cloud will have obvious protrusions, which symbolizes obvious ascending motion; small individuals can be spherical or broken, and the cloud tops are cumulated. Cumulus cloud is composed of water droplets and ice crystals, of which the latter one is mostly distributed in the range below 0 degrees in the upper air. The appearance of cumulus is often accompanied by short-term instantaneous heavy rain (shower phenomenon).