Cirrus Cirrostratus Cirrocumulus Altocumulus Altostratus
Stratocumulus Stratus Nimbostratus Cumulus Cumulonimbus
other cloud photos cloud movies other appearances
Cloud Atlas -> Cirrus

Cirrus (Ci)

Fibrous, threadlike, white feather clouds of ice crystals, whose form resembles hair curls.


  • By turbulence when strong vertical change of the wind direction.

  • By convection in unstable layers of the upper atmosphere.

  • By outblow of ice crystals from a Cumulonimbus or from other high-reaching clouds when they dissolve (Cirrocumulus, Altocumulus)

Possible cloud species, subspecies and special forms:

name abbr. meaning
Cirrus fibratus Ci fib thin fibers or threads
Cirrus uncinus Ci unc comma-shaped or hooked fibers or threads.
Cirrus spissatus Ci spi dense, often grey looking patches, the sun partially masking or covering.
Cirrus castellanus Ci cas Small turrets-like excrescences.
Cirrus floccus Ci flo flaked, puffy
name abbr. meaning
Cirrus intortus Ci in interlaced
Cirrus vertebratus Ci ve Like a spinal column or fishbones arranged cloud parts.
Cirrus radiatus Ci ra gathering apparently against the horizon, the whole sky covering bands.
Cirrus duplicatus Ci du In two or several layers lying one above the other.
special forms
name abbr. meaning
Cirrus mamma Ci mam sac-like, wart-like excrescences at the bottom side of the cloud

photos of Cirrus:

Cirrus intortus Cirrus fibratus Cirrus fibratus  

other Cirrus clouds: [1][2][3][4][5][6][7][8]


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