Cumulonimbus calvus

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  Cumulus

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  Pyrocumulus cloud

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  A cumulonimbus incus (Latin incus, "anvil") is a cumulonimbus cloud which has reached the level of stratospheric stability and has formed the characteristic flat, anvil-top shape. It can cause a supercell and then a tornado. A cumulonimbus incus is a sub-form of cumulonimbus capillatus.