Vaisala FD12P - Manual (Page 144)

User's Guide _______________________________________________________________________
144 _____________________________________________________ M210296en-A
Code figures 20 to 25 are used, if precipitation or fog was observed
during the preceding hour but not at the time of observation.
Table 32 WMO SYNOP Codes (4680, W
a
W
a
)
Code Weather type
20
Fog
21 PRECIPITATION
22 Drizzle (not freezing) or snow grains
23 Rain (not freezing)
24 Snow
25 Freezing rain or freezing drizzle
The following code figures are used if precipitation or fog is observed
at the time of observation.
Table 33 WMO SYNOP Codes (4680, W
a
W
a
)
Code Weather type
30
FOG
31 Fog or ice fog, in patches.
32 Fog or ice fog, has become thinner during the past hour.
33 Fog or ice fog, not applicable change during the past hour.
34 Fog or ice fog, has begun or become thicker during the past hour.
40 PRECIPITATION
41 Precipitation, slight or moderate
42 Precipitation, heavy
50 DRIZZLE
51 Drizzle, not freezing, slight
52 Drizzle, not freezing, moderate
53 Drizzle, not freezing, heavy
54 Drizzle, freezing, light
55 Drizzle, freezing, moderate
56 Drizzle, freezing, heavy
60 RAIN
61 Rain, light
62 Rain, moderate
63 Rain, heavy
64 Rain, freezing, light
65 Rain, freezing, moderate
66 Rain, freezing, heavy
67 Rain, (or drizzle) and snow, light
68 Rain, (or drizzle) and snow, moderate or heavy
70 SNOW
71 Snow, light
72 Snow, moderate
73 Snow, heavy
74 Ice pellets, light
75 Ice pellets, moderate
76 ice pellets, heavy
77 Snow grains (from WMO 4677)
78 Ice crystals (from WMO 4677)