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.

<gallery> Image:Anvil cumulus feb 2007.jpg|Anvil Cumulonimbus incus, February 2007 Image:Cumulonimbus incus cloud.jpg|Cumulonimbus incus Image:Cumulonimbus incus cloud Jan2008.jpg|Cumulonimbus incus with little precipitation observed </gallery>

External links

• Picture of a fully developed Cb inc

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