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Cirrus Clouds

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Cirrus clouds are relatively thin and wispy clouds that usually form above 18000 feet/5,5 km above sealevel. Cirrus clouds generally move from west to east across the sky and usually move in the direction of fair weather. Cirrus clouds form when water vapor undergoes deposition and forms ice crystals. Cirrus clouds are thin because they form in the higher levels of the atmosphere where only little water vapor is present. Cirrus clouds can also form from orphan thunderstorm anvils. In case of an approaching frontal system, Cirrus clouds are usually the first clouds to cover the sky.




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