A cumulonimbus incus (from Latin incus 'anvil'), also called an anvil cloud, is a cumulonimbus cloud that has reached the level of stratospheric stability and has formed the characteristic flat, anvil-shaped top. It signifies a thunderstorm in its mature stage, succeeding the cumulonimbus calvus stage. Cumulonimbus incus is a subtype of cumulonimbus capillatus. These clouds are commonly associated with severe weather, including heavy rain, downbursts, and occasionally a tornado.
|Genus||Cumulonimbus (heap, cloud/severe rain)|
|Species||Capillatus (Having hair)|
|Altitude||Ground to 23,000 m|
|Classification||Family C (Low-level)|
|Appearance||Large flat-top cloud|
|Precipitation||Very common rain, snow, snow pellets or hail, heavy at times|
A cumulonimbus incus is a mature thunderstorm cloud generating many dangerous elements.
Cumulonimbus clouds can be powerful. If the correct atmospheric conditions are met, they can grow into a supercell storm. This cloud may be a single-cell thunderstorm or one cell in a multicellular thunderstorm. They are capable of producing severe storm conditions for a short amount of time.