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Cirrus Cirrostratus Cirrocumulus Altocumulus Altostratus
Stratocumulus Stratus Nimbostratus Cumulus Cumulonimbus
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Cloud Atlas -> Cumulonimbus

Cumulonimbus (Cb)

Description:
In the middle or lower cloud level developing thundercloud, which mostly up-rises into the upper cloud level.

Origin:
The Cumulonimbus always indicates a strong instability to the layering of air with appropriate convection or turbulence.

Possible cloud species, subspecies and special forms:

species
name shortcut meaning
Cumulonimbus calvus Cb cal Preponderant smooth forms; the swellings at the summit lose the sharp outlines.
Cumulonimbus capillatus Cb cap Upper section consists of a frayed, fibrous or streaky cloud mass.
special forms
name shortcut meaning
Cumulonimbus incus Cb inc With anvil-like upper section.
Cumulonimbus mamma Cb mam sac-like, wart-like excrescences at the bottom side of the cloud
Cumulonimbus virga Cb vir with drop strips
Cumulonimbus praecipitatio Cb pra With precipitation (rain, hail, snow, ripe or ice pillet) in shower form.
Cumulonimbus arcus Cb arc With gust collar at the bottom side of the clud.
Cumulonimbus tuba Cb tub with funnel cloud or tornado
Cumulonimbus pileus Cb pil with cap
Cumulonimbus velum Cb vel with veil
Cumulonimbus pannus Cb pan with frazzles at the bottom side of the cloud.

photos of Cumulonimbus:

Cumulonimbus mamma Cumulonimbus incus Cumulonimbus pannus Cumulonimbus calvus
Cumulonimbus incus Cumulonimbus calvus Cumulonimbus pannus Cumulonimbus pileus

other Cumulonimbus clouds: [1][2][3][4][5][6][7][8][9][10][11][12][13]
 

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