| Code/Flag Figure |
Description |
Status |
|
0
|
Reserved
|
Operational
|
|
1
|
Highest wind speed gusts greater than 11.5 m/s
|
Operational
|
|
2
|
Highest mean wind speed greater than 17.5 m/s
|
Operational
|
|
3-6
|
Reserved
|
Operational
|
|
7
|
Visibility greater than 100 000 m
|
Operational
|
|
8-9
|
Reserved
|
Operational
|
|
10
|
Mirage - No specification
|
Operational
|
|
11
|
Mirage - Image of distant object raised (looming)
|
Operational
|
|
12
|
Mirage - Image of distant object raised clear above the horizon
|
Operational
|
|
13
|
Mirage - Inverted image of distant object
|
Operational
|
|
14
|
Mirage - Complex, multiple images of distant object (images not inverted)
|
Operational
|
|
15
|
Mirage - Complex, multiple images of distant object (some images being inverted)
|
Operational
|
|
16
|
Mirage - Sun or moon seen appreciably distorted
|
Operational
|
|
17
|
Mirage - Sun visible, although astronomically below the horizon
|
Operational
|
|
18
|
Mirage - Moon visible, although astronomically below the horizon
|
Operational
|
|
19
|
Reserved
|
Operational
|
|
20
|
Day darkness, bad, worst in direction specified
|
Operational
|
|
21
|
Day darkness, very bad, worst in direction specified
|
Operational
|
|
22
|
Day darkness, black, worst in direction specified
|
Operational
|
|
23-30
|
Reserved
|
Operational
|
|
31
|
Slight coloration of clouds at sunrise associated with a tropical disturbance
|
Operational
|
|
32
|
Deep-red coloration of clouds at sunrise associated with a tropical disturbance
|
Operational
|
|
33
|
Slight coloration of clouds at sunset associated with a tropical disturbance
|
Operational
|
|
34
|
Deep-red coloration of clouds at sunset associated with a tropical disturbance
|
Operational
|
|
35
|
Convergence of CH clouds at a point below 45° forming or increasing and associated with a tropical disturbance
|
Operational
|
|
36
|
Convergence of CH clouds at a point above 45° associated with a tropical disturbance
|
Operational
|
|
37
|
Convergence of CH clouds at a point below 45° dissolving or diminishing and associated with a tropical disturbance
|
Operational
|
|
38
|
Convergence of CH clouds at a point above 45° associated with a tropical disturbance
|
Operational
|
|
39
|
Reserved
|
Operational
|
|
40
|
Hoar frost on horizontal surfaces
|
Operational
|
|
41
|
Hoar frost on horizontal and vertical surfaces
|
Operational
|
|
42
|
Precipitation containing sand or desert dust
|
Operational
|
|
43
|
Precipitation containing volcanic ash
|
Operational
|
|
44-49
|
Reserved
|
Operational
|
|
50
|
Calm or light wind followed by a squall
|
Operational
|
|
51
|
Calm or light wind followed by a succession of squalls
|
Operational
|
|
52
|
Gusty weather followed by a squall
|
Operational
|
|
53
|
Gusty weather followed by a succession of squalls
|
Operational
|
|
54
|
Squall followed by gusty weather
|
Operational
|
|
55
|
General gusty weather with squall at intervals
|
Operational
|
|
56
|
Squall approaching station
|
Operational
|
|
57
|
Line squall
|
Operational
|
|
58
|
Squall with drifting or blowing dust or sand
|
Operational
|
|
59
|
Line squall with drifting or blowing dust or sand
|
Operational
|
|
60
|
Temperature steady
|
Operational
|
|
61
|
Temperature falling, without going below 0°C
|
Operational
|
|
62
|
Temperature rising, without going above 0°C
|
Operational
|
|
63
|
Temperature falling to a value below 0°C
|
Operational
|
|
64
|
Temperature rising to a value above 0°C
|
Operational
|
|
65
|
Irregular variation, oscillations of temperature passing through 0°C
|
Operational
|
|
66
|
Irregular variation, oscillations of temperature not passing through 0°C
|
Operational
|
|
67
|
Variation of temperature not observed
|
Operational
|
|
68
|
Not allocated
|
Operational
|
|
69
|
Variation of temperature unknown owing to lack of thermograph
|
Operational
|
|
70
|
Visibility has not varied (sun visible) towards direction specified
|
Operational
|
|
71
|
Visibility has not varied (sun invisible) towards direction specified
|
Operational
|
|
72
|
Visibility has increased (sun visible) towards direction specified
|
Operational
|
|
73
|
Visibility has increased (sun invisible) towards direction specified
|
Operational
|
|
74
|
Visibility has decreased (sun visible) towards direction specified
|
Operational
|
|
75
|
Visibility has decreased (sun invisible) towards direction specified
|
Operational
|
|
76
|
Fog coming from direction specified
|
Operational
|
|
77
|
Fog has lifted, without dissipating
|
Operational
|
|
78
|
Fog has dispersed without regard to direction
|
Operational
|
|
79
|
Moving patches or banks of fog
|
Operational
|
|
80
|
Brocken spectre
|
Operational
|
|
81
|
Rainbow
|
Operational
|
|
82
|
Solar or lunar halo
|
Operational
|
|
83
|
Parhelia or anthelia
|
Operational
|
|
84
|
Sun pillar
|
Operational
|
|
85
|
Corona
|
Operational
|
|
86
|
Twilight glow
|
Operational
|
|
87
|
Twilight glow on the mountains (Alpenglühen)
|
Operational
|
|
88
|
Mirage
|
Operational
|
|
89
|
Zodiacal light
|
Operational
|
|
90
|
St Elmo's fire
|
Operational
|
|
91-1022
|
Reserved
|
Operational
|
|
1023
|
Missing value
|
Operational
|