Altocumulus castellanus cloud
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Altocumulus castellanus is a family B type cloud.
Altocumulus castellanus is named for its tower-like projections that billow upwards from the base of the cloud. The base of the cloud can form as low as 2,000 metres (6,500 feet), or as high as 6,000 metres (20,000 feet).
Castellanus clouds are a sign of turbulence, and are usually followed by bad weather, continued development of castellanus clouds can produce cumulonimbus clouds.
