Cumulonimbus incus 

Cumulonimbus incus
Cumulonimbus capillatus incus
Cumulonimbus capillatus incus
Abbreviation Cb inc.
Genus Cumulonimbus (heap, cloud/severe rain)
Species Incus (anvil)
Classification Family D (Vertically developed)
Appearance Large flat-top cloud
Precipitation cloud? Yes, often intense
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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.

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