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Cirrus ( cloud classification symbol: Ci) is a genus of high cloud made of ice crystals. Cirrus clouds typically appear delicate and wispy with white strands. Cirrus are usually formed when warm, dry air rises, causing water vapor deposition onto rocky or metallic dust particles at high altitudes.
The list of cloud types groups all genera as high (cirro-, cirrus), middle (alto-), multi-level (nimbo-, cumulo-, cumulus), and low (strato-, stratus). These groupings are determined by the altitude level or levels in the troposphere at which each of the various cloud types is normally found. Small cumulus are commonly grouped with the low ...
Cirrus spissatus is the dense cirrus that will partly or completely hide the sun (or moon) and which appears dark grey when seen against the light. Although it arises under various circumstances, it is particularly commonly found in the plumes or anvils of cumulonimbus clouds . Precipitation is likely within 15 to 25 hours if winds are steady ...
Cirrus uncinus is a type of cirrus cloud. The name cirrus uncinus is derived from Latin, meaning "curly hooks". Also known as mares' tails, these clouds are generally sparse in the sky and very thin. [1] The clouds occur at high altitudes, at a temperature of about −50 to −40 °C (−58 to −40 °F). They are generally seen when a warm or ...
Cirrus fibratus or also called Cirrus filosus is a species of cirrus cloud. The name cirrus fibratus is derived from Latin , meaning "fibrous". [3] These clouds are similar to cirrus uncinus , commonly known as "mares' tails"; however, fibratus clouds do not have tufts or hooks at the end. [4]
Cirrostratus cloud. Thin, transparent, high-altitude layer capable of producing a halo. No, but usually signal the approach of a warm front. But rain in 24 hours. Cirrostratus / ˌsɪroʊˈstrɑːtəs / is a high-altitude, very thin, generally uniform stratiform genus-type of cloud. It is made out of ice -crystals, which are pieces of frozen water.
Cirrus vertebratus is a type of cirrus cloud. The name cirrus vertebratus is derived from Latin, meaning "jointed, articulated, vertebrated". [2] Like cirrus intortus, the vertebratus species is exclusive to the cirrus genus. [3] Cirrus vertebratus gives the impression of vertebrae in a spinal column, ribs, or a fish skeleton.
Cirrus floccus is a type of cirrus cloud. The name cirrus floccus is derived from Latin, meaning "a lock of wool". [1] Cirrus floccus occurs as small tufts of cloud, usually with a ragged base. The cloud can have virga falling from it, but the precipitation does not reach the ground. [2]