Cirrus clouds are high altitude clouds, they are formed by ice crystals which characterize their thin and fibrous shape. Often these clouds provoke precipitations, however, since they are situated at very high altitudes, the precipitation generally evaporates before reaching the ground. read more
Let us first see how a cloud is formed. Clouds form when the air is saturated and cannot hold any more water vapour, this can happen in two ways: The amount of water in the air has increased - for example through evaporation - to the point that the air cannot hold any more water. read more