Name	Notation	Description	Types	Status
Cirrus (Ci)	0		Concept	stable
Cirrocumulus (Cc)	1		Concept	stable
Cirrostratus (Cs)	2		Concept	stable
Altocumulus (Ac)	3		Concept	stable
Altostratus (As)	4		Concept	stable
Nimbostratus (Ns)	5		Concept	stable
Stratocumulus (Sc)	6		Concept	stable
Stratus (St)	7		Concept	stable
Cumulus (Cu)	8		Concept	stable
Cumulonimbus (Cb)	9		Concept	stable
No CH clouds	10		Concept	stable
Cirrus fibratus, sometimes uncinus, not progressively invading the sky	11		Concept	stable
Cirrus spissatus, in patches or entangled sheaves, which usually do not increase and sometimes seem to be the remains of the upper part of a Cumulonimbus; or Cirrus castellanus or floccus	12		Concept	stable
Cirrus spissatus cumulonimbogenitus	13		Concept	stable
Cirrus uncinus or fibratus, or both, progressively invading the sky; they generally thicken as a whole	14		Concept	stable
Cirrus (often in bands) and Cirrostratus, or Cirrostratus alone, progressively invading the sky; they generally thicken as a whole, but the continuous veil does not reach 45 degrees above the horizon	15		Concept	stable
Cirrus (often in bands) and Cirrostratus, or Cirrostratus alone, progressively Invading the sky; they generally thicken as a whole; the continuous veil extends more than 45 degrees above the horizon, without the sky being totally covered	16		Concept	stable
Cirrostratus covering the whole sky	17		Concept	stable
Cirrostratus not progressively invading the sky and not entirely covering it	18		Concept	stable
Cirrocumulus alone, or Cirrocumulus predominant among the CH clouds	19		Concept	stable
No CM clouds	20		Concept	stable
Altostratus translucidus	21		Concept	stable
Altostratus opacus or Nimbostratus	22		Concept	stable
Altocumulus translucidus at a single level	23		Concept	stable
Patches (often lenticular) of Altocumulus translucidus, continually changing and occurring at one or more levels	24		Concept	stable
Altocumulus translucidus in bands, or one or more layers of Altocumulus translucidus or opacus, progressively invading the sky; these Altocumulus clouds generally thicken as a whole	25		Concept	stable
Altocumulus cumulogenitus (or cumulonimbogenitus)	26		Concept	stable
Altocumulus translucidus or opacus in two or more layers, or Altocumulus opacus in a single layer, not progressively invading the sky, or Altocumulus with Altostratus or Nimbostratus	27		Concept	stable
Altocumulus castellanus or floccus	28		Concept	stable
Altocumulus of a chaotic sky, generally at several levels	29		Concept	stable
No CL clouds	30		Concept	stable
Cumulus humilis or Cumulus fractus other than of bad weather,* or both	31		Concept	stable
Cumulus mediocris or congestus, Towering cumulus (TCU), with or without Cumulus of species fractus or humilis or Stratocumulus, all having their bases at the same level	32		Concept	stable
Cumulonimbus calvus, with or without Cumulus, Stratocumulus or Stratus	33		Concept	stable
Stratocumulus cumulogenitus	34		Concept	stable
Stratocumulus other than Stratocumulus cumulogenitus	35		Concept	stable
Stratus nebulosus or Stratus fractus other than of bad weather,* or both	36		Concept	stable
Stratus fractus or Cumulus fractus of bad weather,* or both (pannus), usually below Altostratus or Nimbostratus	37		Concept	stable
Cumulus and Stratocumulus other than Stratocumulus cumulogenitus, with bases at different levels	38		Concept	stable
Cumulonimbus capillatus (often with an anvil), with or without Cumulonimbus calvus, Cumulus, Stratocumulus, Stratus or pannus	39		Concept	stable
CH	40		Concept	stable
CM	41		Concept	stable
CL	42		Concept	stable
Cloud not visible owing to darkness, fog, duststorm, sandstorm, or other analogous phenomena	59		Concept	stable
CH clouds invisible owing to darkness, fog, blowing dust or sand, or other similar phenomena, or because of a continuous layer of lower clouds	60		Concept	stable
CM clouds invisible owing to darkness, fog, blowing dust or sand, or other similar phenomena, or because of continuous layer of lower clouds	61		Concept	stable
CL clouds invisible owing to darkness, fog, blowing dust or sand, or other similar phenomena	62		Concept	stable
Missing value	63		Concept	stable