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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.
Learn all about cirrus clouds, including cirrus cloud description and facts, images, how to best identify them, and their species, varieties, and features.
Cirrus clouds are thin, delicate types of clouds found at high altitudes, typically above 20,000 feet (6,000 meters). They are composed of tiny ice crystals and form in the upper...
From his Essay of the Modifications of Clouds (1803), Luke Howard divided clouds into three categories: cirrus, cumulus, and stratus, plus a fourth special type, nimbus. While clouds appear in infinite shapes and sizes, they fall into some basic forms.
Cirrus clouds are the wispy clouds that form at high altitudes. A new study looks at how they form and how this changes scientists' view of these clouds’ role in the world's climate.
Cirrus clouds are short, detached, hair-like clouds found at high altitudes. These delicate clouds are wispy, with a silky sheen, or look like tufts of hair. In the daytime,...
Cirrus clouds are wispy, feathery, and composed entirely of ice crystals. They often are the first sign of an approaching warm front or upper-level jet streak. Unlike cirrus, cirrostratus clouds form more of a widespread, veil-like layer (similar to what stratus clouds do in low levels).
The 4 main types of clouds are cirrus, cumulus, stratus, and nimbus, but they combine to make 10 types of clouds. Other kinds of clouds exist, too. The World Meteorological Organization lists over 100 different types of clouds in its International Cloud Atlas.
This photo shows transparent to translucent cirrus streaks, and illustrates why cirrus clouds are often described as mare's tails. The streaks come from falling ice particles that make up the clouds. Photo by Lin Chambers, August, 2002.
Cirrus clouds are composed almost exclusively of ice crystals. These crystals are generally very small, which, together with their sparseness, accounts for the transparency of most Cirrus clouds.