Cirrus Clouds
Cirrus clouds form above 23,000 feet (about 7,000m), in the cold region of the troposphere. They are denoted by the prefix cirro- or cirrus. 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 precipitation, however, large amounts of cirrus clouds can indicate an approaching storm system.
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