Name	Notation	Description	Types	Status
Isolated cumulus humilis and/or cumulus mediocris of vertical development	0		Concept	stable
Numerous cumulus humilis and/or cumulus mediocris of vertical development	1		Concept	stable
Isolated cumulus congestus of vertical development	2		Concept	stable
Numerous cumulus congestus of vertical development	3		Concept	stable
Isolated cumulonimbus of vertical development	4		Concept	stable
Numerous cumulonimbus of vertical development	5		Concept	stable
Isolated cumulus and cumulonimbus of vertical development	6		Concept	stable
Numerous cumulus and cumulonimbus of vertical development	7		Concept	stable
Isolated orographic clouds, pileus, incus, forming	11		Concept	stable
Isolated orographic clouds, pileus, incus, not changing	12		Concept	stable
Isolated orographic clouds, pileus, incus, dissolving	13		Concept	stable
Irregular banks of orographic cloud, föhn bank, etc., forming	14		Concept	stable
Irregular banks of orographic cloud, föhn bank, etc., not changing	15		Concept	stable
Irregular banks of orographic cloud, föhn bank, etc., dissolving	16		Concept	stable
Compact layer of orographic cloud, föhn bank, etc., forming	17		Concept	stable
Compact layer of orographic cloud, föhn bank, etc., not changing	18		Concept	stable
Compact layer of orographic cloud, föhn bank, etc., dissolving	19		Concept	stable
All mountains open, only small amounts of cloud present	20		Concept	stable
Mountains partly covered with detached clouds (not more than half the peaks can be seen)	21		Concept	stable
All mountain slopes covered, peaks and passes free	22		Concept	stable
Mountains open on observer’s side (only small amounts of cloud present), but a continuous wall of cloud on the other side	23		Concept	stable
Clouds low above the mountains, but all slopes and mountains open (only small amounts of cloud on the slopes)	24		Concept	stable
Clouds low above the mountains, peaks partly covered by precipitation trails or clouds	25		Concept	stable
All peaks covered but passes open, slopes either open or covered	26		Concept	stable
Mountains generally covered but some peaks free, slopes wholly or partially covered	27		Concept	stable
All peaks, passes and slopes covered	28		Concept	stable
Mountains cannot be seen owing to darkness, fog, snowstorm, precipitation, etc.	29		Concept	stable
Non-persistent condensation trails	35		Concept	stable
Persistent condensation trails covering less than 1/8 of the sky	36		Concept	stable
Persistent condensation trails covering 1/8 of the sky	37		Concept	stable
Persistent condensation trails covering 2/8 of the sky	38		Concept	stable
Persistent condensation trails covering 3/8 or more of the sky	39		Concept	stable
No cloud or mist observed from a higher level	40		Concept	stable
Mist, clear above observed from a higher level	41		Concept	stable
Fog patches observed from a higher level	42		Concept	stable
Layer of slight fog observed from a higher level	43		Concept	stable
Layer of thick fog observed from a higher level	44		Concept	stable
Some isolated clouds observed from a higher level	45		Concept	stable
Isolated clouds and fog below observed from a higher level	46		Concept	stable
Many isolated clouds observed from a higher level	47		Concept	stable
Sea of clouds observed from a higher level	48		Concept	stable
Bad visibility obscuring the downward view observed from a higher level	49		Concept	stable
Missing value	511		Concept	stable