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Cirrostratus

Cloud
Cirrostratus is a high-altitude, very thin, generally uniform stratiform genus-type of cloud. It is made out of ice-crystals, which are pieces of frozen water. It is difficult to detect and it can make halos. These are made when the cloud takes... Wikipedia
Abbreviation: Cs
Altitude: 6,000 - 13,000 m; (20,000 - 43,000 ft)
Appearance: Thin, transparent, high-altitude layer capable of producing a halo
Classification: Family A (High-level)
Precipitation: No, but usually signal the approach of a warm front. But rain in 24 hours