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