Clouds
- Introduction and principles of cloud classification
  - Definition of a cloud
  - Appearance of clouds
  - Principles of cloud classification
  - Cloud classification summary
  - Cloud abbreviations and symbols
    - Genera and species
    - Varieties, supplementary features and accessory clouds
    - Mother-clouds and special clouds
- Definitions of clouds
- Descriptions of clouds
- Orographic influences on clouds
- Upper atmospheric clouds

Varieties, supplementary features and accessory clouds

(Section 2.1.5.2)

Table 4. Abbreviations for cloud varieties, supplementary features and accessory clouds

Varieties		Supplementary features		Accessory clouds
Designation	Abbreviation	Designation	Abbreviation	Designation	Abbreviation
intortus	in	incus	inc	pileus	pil
vertebratus	ve	mamma	mam	velum	vel
undulatus	un	virga	vir	pannus	pan
radiatus	ra	cavum	cav	flumen	flm
lacunosus	la	fluctus	flu
duplicatus	du	asperitas	asp
translucidus	tr	praecipitatio	pra
perlucidus	pe	arcus	arc
opacus	op	murus	mur
		tuba	tub
		cauda	cau

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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.

Varieties, supplementary features and accessory clouds

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