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Undulatus

(Section 2.2.2.3.3)

Clouds in patches, sheets or layers, showing undulations. 

These undulations may be observed in fairly uniform cloud layers or in clouds composed of elements, separate or merged. Sometimes a double system of undulations is in evidence.

This term applies mainly to Cirrocumulus, Cirrostratus, Altocumulus, Altostratus, Stratocumulus and Stratus.

P.5.4

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