Coding instructions CH
(Section 2.8.3.3)
- If Cirrocumulus is alone or with other cirriform cloud but predominates the sky, the coding is CH = 9
- If Cirrostratus is covering the whole sky, the coding is CH = 7
- If Cirrostratus is not invading the sky and not entirely covering it, the coding is CH = 8
- If Cirrostratus is progressively invading the sky and extends more than 45° above the horizon but is not covering the whole sky, the coding is CH = 6
- If Cirrostratus is progressively invading the sky and extends less than 45° above the horizon, the coding is CH = 5
- If Cirrus uncinus and/or fibratus is progressively invading the sky, the coding is CH = 4
- If one of the Cirrus spissatus clouds originates from a Cumulonimbus, the coding is CH = 3
- If the sky cover of Cirrus spissatus non-cumulonimbogenitus and Cirrus castellanus and/or floccus predominates, the coding is CH = 2
- Cirrus fibratus and/or uncinus are coded as CH = 1
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