| Code/Flag Figure |
Description |
Status |
|
0
|
Cirrus (Ci)
|
Operational
|
|
1
|
Cirrocumulus (Cc)
|
Operational
|
|
2
|
Cirrostratus (Cs)
|
Operational
|
|
3
|
Altocumulus (Ac)
|
Operational
|
|
4
|
Altostratus (As)
|
Operational
|
|
5
|
Nimbostratus (Ns)
|
Operational
|
|
6
|
Stratocumulus (Sc)
|
Operational
|
|
7
|
Stratus (St)
|
Operational
|
|
8
|
Cumulus (Cu)
|
Operational
|
|
9
|
Cumulonimbus (Cb)
|
Operational
|
|
10
|
No CH clouds
|
Operational
|
|
11
|
Cirrus fibratus, sometimes uncinus, not progressively invading the sky
|
Operational
|
|
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
|
Operational
|
|
13
|
Cirrus spissatus cumulonimbogenitus
|
Operational
|
|
14
|
Cirrus uncinus or fibratus, or both, progressively invading the sky; they generally thicken as a whole
|
Operational
|
|
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
|
Operational
|
|
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
|
Operational
|
|
17
|
Cirrostratus covering the whole sky
|
Operational
|
|
18
|
Cirrostratus not progressively invading the sky and not entirely covering it
|
Operational
|
|
19
|
Cirrocumulus alone, or cirrocumulus predominant among the CH clouds
|
Operational
|
|
20
|
No CM clouds
|
Operational
|
|
21
|
Altostratus translucidus
|
Operational
|
|
22
|
Altostratus opacus or nimbostratus
|
Operational
|
|
23
|
Altocumulus translucidus at a single level
|
Operational
|
|
24
|
Patches (often lenticular) of altocumulus translucidus, continually changing and occurring at one or more levels
|
Operational
|
|
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
|
Operational
|
|
26
|
Altocumulus cumulogenitus (or cumulonimbogenitus)
|
Operational
|
|
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
|
Operational
|
|
28
|
Altocumulus castellanus or floccus
|
Operational
|
|
29
|
Altocumulus of a chaotic sky, generally at several levels
|
Operational
|
|
30
|
No CL clouds
|
Operational
|
|
31
|
Cumulus humilis or cumulus fractus other than of bad weather, or both
|
Operational
|
|
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
|
Operational
|
|
33
|
Cumulonimbus calvus, with or without cumulus, stratocumulus or stratus
|
Operational
|
|
34
|
Stratocumulus cumulogenitus
|
Operational
|
|
35
|
Stratocumulus other than stratocumulus cumulogenitus
|
Operational
|
|
36
|
Stratus nebulosus or stratus fractus other than of bad weather, or both
|
Operational
|
|
37
|
Stratus fractus or cumulus fractus of bad weather, or both (pannus), usually below altostratus or nimbostratus
|
Operational
|
|
38
|
Cumulus and stratocumulus other than stratocumulus cumulogenitus, with bases at different levels
|
Operational
|
|
39
|
Cumulonimbus capillatus (often with an anvil), with or without cumulonimbus calvus, cumulus, stratocumulus, stratus or pannus
|
Operational
|
|
40
|
CH
|
Operational
|
|
41
|
CM
|
Operational
|
|
42
|
CL
|
Operational
|
|
43
|
Clear
|
Operational
|
|
44
|
Liquid water
|
Operational
|
|
45
|
Supercooled liquid water
|
Operational
|
|
46
|
Mixed phase
|
Operational
|
|
47
|
Optically thick ice
|
Operational
|
|
48
|
Optically thin ice
|
Operational
|
|
49
|
Multilayered ice
|
Operational
|
|
50-58
|
Reserved
|
Operational
|
|
59
|
Cloud not visible owing to darkness, fog, duststorm, sandstorm, or other analogous phenomena
|
Operational
|
|
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
|
Operational
|
|
61
|
CM clouds invisible owing to darkness, fog, blowing dust or sand, or other similar phenomena, or because of continuous layer of lower clouds
|
Operational
|
|
62
|
CL clouds invisible owing to darkness, fog, blowing dust or sand, or other similar phenomena
|
Operational
|
|
63
|
Missing value
|
Operational
|