Relation To Other Clouds
Cumulus clouds are a form of low-étage cloud along with the related cumuliform cloud stratocumulus. These clouds form from ground level to 6,500 feet (2,000 m) at all latitudes. Stratus clouds are also low-étage. In the middle étage are the alto clouds, which consist of the cumuliform cloud altocumulus and the stratiform cloud altostratus. Middle-étage clouds form from 6,500 feet (2,000 m) to 13,000 feet (4,000 m) in polar areas, 23,000 feet (7,000 m) in temperate areas, and 25,000 feet (7,600 m) in tropical areas. The high-étage clouds are all cirriform, one of which, cirrocumulus, is also cumuliform. The other clouds in this étage are cirrus and cirrostratus. High-étage clouds form 10,000 to 25,000 feet (3,000 to 7,600 m) in high latitudes, 16,500 to 40,000 feet (5,000 to 12,000 m) in temperate latitudes, and 20,000 to 60,000 feet (6,100 to 18,000 m) in low, tropical latitudes. Cumulonimbus clouds, the other cumuliform cloud, extend vertically rather than remaining confined to one étage.
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