Cirrus

In Meteorology, the cirrus (abbreviation Ci) is a Nuage of the upper floor of the Troposphère (between 6000 and 12000 meters of Altitude) to the appearance of formed white filaments of crystals of Glace. The great dispersion of these crystals makes that the cirri are transparent. The sunlight the cross-piece practically without being attenuated and they become pink or red after the Coucher sun.

The cirri are generally regarded as clouds not precipitants. However, it is not rare that they are dissipated by sedimentation of their crystals, creating Virga then.

Various types

One distinguishes: Cirrus castellanus, Cirrus duplicatus, Cirrus fibratus, Cirrus floccus, Cirrus mare's tail cirrus, Cirrus Kelvin-Helmholtz, Cirrus spissatus, Cirrus vertebratus, Cirrus uncinus.

Forecasts

The appearance of cirrus in a blue sky generally announces the arrival of a hot face accompanied by rain or snow and grelon, or the end of a stormy activity. In Provence, appearance of cirrus in the West east often harbinger of the mistral.

Etymology

The term cirrus , means “loop of hair” in Latin. It was given to this cloud in reference to the typical form of the Cirrus uncinus (in “comma”), which resembles a loop of hair.

Other acceptances

Cirrus is also the name of a very known sailplane.

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