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Coding instructions of clouds in the codes CL, CM and CH

(Section 2.8.3)

There are strict rules and priorities to be followed in order to code the sky view correctly. The highest priority is at the top. If the first point (1) is not applicable, continue with the next point (2). Continue down until you reach the cloud you are observing. If you identify more than one cloud, report the cloud with the priority.


When applying the coding instructions, the word “present” means, that if this cloud type occurs simultaneously with others, even predominate clouds, the stated priority leads the observer to choose the correct code figure for the observed sky.

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