![]() Cirrus clouds usually form in the summer and winter, when opposing weather fronts meet, such as warm, dry air and cool, dry air. In the case of Cirrus Kelvin-Helmholtz, the clouds lie in the turbulent atmospheric region. Other formations include cirrus aviaticus (also called contrails, the artificial cirrus clouds generated by aircraft), cirrus castellanus (castle-like, with towers rising from a base), cirrus duplicatus (multiple sheets), cirrus fibratus (fibrous, and resembling a horse’s tail), cirrus floccus (rounded above), cirrus intortus (tangled), cirrus Kelvin-Helmholtz (slender and signaling atmospheric turbulence), cirrus radiatus (with horizontal banding), cirrus spissatus (thick and gray in color when in front of the sun), cirrus uncinus (hooked, and reminiscent of cirrus fibratus but with more curling at the ends), cirrus vertebratus (rib-like horizontal strips of clouds), and cirrus with mamma-tus (rounded underneath).Ĭirrus clouds are generally seen in fair weather, sometimes following a thunderstorm, and their wisps typically point in the direction of the high-altitude wind flow. ![]() Some cirrus clouds are called cirrostratus this type of cloud formation occurs when the thin strands of clouds are so dense that they cannot be deciphered. ![]() If cirrus clouds drop their ice crystals, these crystals evaporate before they arrive at the ground.Ĭirrus clouds can take on a variety of formations, including a more tuft-like characteristic called cirro-cumulus, which also include supercooled water droplets. They are composed predominantly of tiny ice crystals, because they form in the cold region of the troposphere. The name cirrus comes from the Latin word for curl. CIRRUS CLOUDS ARE the thin and wisp-like clouds seen at high altitudes (higher than 20,000 to 26,000 ft., or 6,000 to 8,000 m.). ![]()
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