Clouds
- Introduction and principles of cloud classification
- Definitions of clouds
  - Useful concepts
  - Definitions of clouds
    - Genera
    - Species
    - Varieties
      - Intortus
      - Vertebratus
      - Undulatus
      - Radiatus
      - Lacunosus
      - Duplicatus
      - Translucidus
      - Perlucidus
      - Opacus
      - Table of varieties and the genera with which they most frequently occur
    - Supplementary features
    - Accessory Clouds
    - Special clouds
- Descriptions of clouds
- Orographic influences on clouds
- Upper atmospheric clouds

Table of varieties and the genera with which they most frequently occur

(Section 2.2.2.3.10)

Table 8. Cloud varieties and the genera with which they most frequently occur

Genera Varieties	Ci	Cc	Cs	Ac	As	Ns	Sc	St	Cu	Cb
intortus (in)	●
vertebratus (ve)	●
undulatus (un)		●	●	●	●		●	●
radiatus (ra)	●			●	●		●		●
lacunosus (la)		●		●			●
duplicatus (du)	●		●	●	●		●
translucidus (tr)				●	●		●	●
perlucidus (pe)				●			●
opacus (op)				●	●		●	●

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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.

Table of varieties and the genera with which they most frequently occur

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