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Status: STD 2005/06/07
Code: 522

Concept definition: A <CLOUD> of the genus cirrus, cirrocumulus, or cirrostratus; high cloud. Also the top of a <CLOUD> of the genus cumulonimbus or, occasionally, altostratus.
Reference type: PR
Reference: [WMO407, Section II.2.1.2]
Supplemental references: [GMET, "cloud classification", 2, "high clouds"]

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