Ci compared with As

(Section 2.3.1.6.4)

Thick Cirrus is distinguished from Altostratus patches by:

Smaller horizontal extent
Mostly white appearance
Absence of precipitation or virga
Absence of undulations

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.

Ci compared with As

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