Cumulonimbus capillatus
Abbreviation Cb cap
Family D
Genus Cumulonimbus
Occurrence Worldwide except Antarctica
Altitude 600-18000m
Formation powerful convection assisted by atmospheric instability
Precipitation Heavy rain or hail
Potential Hazards Severe turbulence, thunderstorms, hail, tornadoes, lightning, strong winds

Cumulonimbus capillatus is a species of very large cumulonimbus cloud with a developed cirriform top composed of ice crystals (often an anvil, in which case the cloud is a cumulonimbus incus) that can extend to the tropopause. From ground level, cumulonimbus capillatus clouds may look dark grey and cover the sky.


Cumulonimbus incus

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