C_L = /

(Section 2.8.2.1.10)

(a) TECHNICAL SPECIFICATION

C_L clouds are not observable owing to darkness, fog, blowing dust or sand, or other similar phenomena.

The text enclosed in grey-shaded boxes, like this example, comprises Annex I to the Technical Regulations (WMO-No. 49) and has the legal status of standard practices and procedures.

CL = /

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C_L = /