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CL3 Cumulonimbus without anvil

If, in this case, it is not possible to decide whether the cloud is CL 3 or CL 9, the coding is, by convention CL = 9.

Cb Cal
Cloud base about 3,000 ft. C.S. Broomfield (© Crown Copyright)

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Related pages: Cloud classification | CL guide | CM guide | CH guide | Cloud index