TABLE AIV-14.—WMO CODE 4377
WMO CODE 4377
VV- Horizontal visibility at the surface.
KM
MI
CODE
KM
MI
CODE
KM
MI
C O D E K M
CODE
<0.1
<1/16
00
2.6
1 5/8
26
N U
51
26
76
0.1
1/16
01
2.7
27
O S
52
27
77
0.2
1/8
02
2.8
1 3/4
28
T E
53
28
78
0.3
3/16
03
2.9
29
D
54
29
79
0.4
1/4
04
3.0
1 7/8
30
55
30
80
0.5
5/16
05
3.1
31
- - -
- - -
- - -
- - -
0.6
3/8
06
3.2
2
32
6
4
56
35
81
0.7
07
3.3
33
7
57
40
82
0.8
1/2
08
3.4
34
8
5
58
45
83
0.9
09
3.5
35
9
59
50
84
1.0
5/8
10
3.6
2 1/4
36
10
6
60
55
85
1.1
11
3.7
37
11
7
61
60
86
1.2
3/4
12
3.8
38
12
62
65
87
1.3
13
3.9
39
13
8
63
70
88
1.4
7/8
14
4.0
2 1/2
40
14
9
64
>70
89
1.5
15
4.1
41
15
65
- - -
- - -
1.6
1
16
4.2
42
16
10
66
<0.05
90
1.7
17
4.3
43
17
67
0.05
91
1.8
1 1/8
18
4.4
2 3/4
44
18
11
68
0.2
92
1.9
19
4.5
45
19
12
69
0.5
93
2.0
1 1/4
20
4.6
46
20
70
1
94
2.1
21
4.7
47
21
13
71
2
95
2.2
1 3/8
22
4.8
3
48
22
72
4
96
2.3
23
4.9
49
23
14
73
10
97
2.4
1 1/2
24
5.0
50
24
15
74
20
98
2.5
25
25
75
>50
99
Table AIV-15.—WMO CODE 1751
WMO CODE 1751
Is - Ice accretion on ships.
Code
Source of Ice
1
Ice from ocean spray.
2
Ice from fog.
3
Ice from spray and fog.
4
Ice from rain.
5
Ice from spray and rain.
AIV-17
