Although they are a sign that rain and maybe storms are on the way, cirrus themselves drop no more than falling streaks of ice crystals. Globally, they form anywhere between 4,000 and 20,000 meters (13,000 and 66,000 feet) above sea level, with the higher elevations usually in the tropics and the lower elevations in more polar regions.Ĭirrus clouds can form from the tops of thunderstorms and tropical cyclones and sometimes predict the arrival of rain or storms. Cirrus are usually formed as warm, dry air rises, causing water vapor deposition onto rocky or metallic dust particles at high altitudes. Cirrus clouds typically appear delicate and wispy with white strands. Sky containing different types of cirrus cloudsĬirrus ( cloud classification symbol: Ci) is a genus of high cloud made of ice crystals.
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