Los cirrocúmulos son nubes que se encuentran en las capas altas del cielo y se forman horizontalmente. Se dan entre los 6 y los 12 km de altitud. Su símbolo es: Se forman a partir de cirros o cirrostratos cuando estas son calentadas suavemente desde abajo.Este proceso de calentamiento hace que el aire se eleve y se meta dentro de la nube. Esta es la razón por la cual el cirrocúmulo se encuentra asociado casi siempre con cirros y al cirroestratos. Si este no es el caso, la nube es entonces un altocúmulo.

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Cirrocumulus is one of the three main genus-types of high-altitude tropospheric clouds, the other two being cirrus and cirrostratus. They usually occur at an altitude of 5 kilometres (16,000 ft) to 12 kilometres (39,000 ft). Like lower altitude cumuliform and stratocumuliform clouds, cirrocumulus signifies convection. Unlike other high cirrus and cirrostratus, cirrocumulus includes a small amount of liquid water droplets, although these are in a supercooled state. Ice crystals are the predominant component, and typically, the ice crystals cause the supercooled water drops in the cloud to rapidly freeze, transforming the cirrocumulus into cirrostratus. This process can also produce precipitation in the form of a virga consisting of ice or snow. Thus cirrocumulus clouds are usually short-lived. They usually only form as part of a short-lived transitional phase within an area of cirrus clouds and can also form briefly as a result of the breaking up of part of a cumulonimbus anvil. Properly, the term cirrocumulus refers to each cloud, but is typically also used to refer to an entire patch of cirrocumulus. When used in this way, each cirrocumulus element is referred to as a "cloudlet".

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