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Clouds from which Cumulonimbus may form


Cumulonimbus most commonly evolves from:

Cumulonimbus also forms from:

  • Altocumulus castellanus (Cb altocumulogenitus); the base of the Cumulonimbus is unusually high
  • Stratocumulus castellanus (Cb stratocumulogenitus)
  • Transformation and development of a portion of Altostratus or Nimbostratus (Cb altostratogenitus or Cb nimbostratogenitus)

In the majority of these cases, the transformation into Cumulonimbus passes through the Cumulus congestus stage.

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