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Clouds of the genus Cirrocumulus form when moist air at a high altitude reaches saturation, creating ice crystals. Convective instability at the cloud level gives the cloud its cumuliform appearance.

Cirrus Cloud form in the highest and coldest region of the troposphere. At this altitude water almost always freezes so clouds are composed of ice crystals. The clouds tend to be wispy, and are often transparent. Isolated cirrus clouds often do not bring rain, however, large amounts of cirrus clouds can indicate an approaching storm system eventually followed by fair weather.