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

Altocumulus (Ac)

Grey cloud bundles, sheds or rollers, compound like rough fleecy cloud, which are often arranged in banks.


  • By rise of an expanded air layer at the border of a rising zone.

  • By convection or turbulence within an unstable layer of the middle cloud level.

  • By transformation from Altostratus und Nimbostratus at lability or Cumulus and Cumulonimbus at stability.

Possible cloud species, subspecies and special forms:

name shorcut meaning
Altocumulus castellanus Ac cas from a common cloud bank such as growing turrets.
Altocumulus floccus Ac flo Individual small bundles with fringy lower parts, frequently with schleps.
Altocumulus stratiformis Ac str Expanded horizontal fields or layers.
Altocumulus lenticularis Ac len lense-shaped, almond-shaped
name shorcut meaning
Altocumulus undulatus Ac un wavelike
Altocumulus radiatus Ac ra radially, parallel bands and strips
Altocumulus lacunosus Ac la perforated (round frayed holes)
Altocumulus duplicatus Ac du In two or several layers lying one above the other.
Altocumulus perlucidus Ac pe irregular sample of small gaps in the cloud cover
Altocumulus translucidus Ac tr translucently
Altocumulus opacus Ac op dark cloud cover, sun or moon is not recognizably.
special forms
name shorcut meaning
Altocumulus mamma Ac mam sac-like, wart-like excrescences at the bottom side of a dense cloud cover
Altocumulus virga Ac vir with drop strips

photos of Altocumulus:

Altocumulus translucidus Altocumulus virga Altocumulus virga Altocumulus virga
Altocumulus lenticularis Altocumulus floccus Altocumulus stratiformis Altocumulus lenticularis

other Altocumulus clouds: [1][2][3][4][5][6][7][8][9][10]

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