Coded Lookup Table for TDF-11 Present Weather


pr_wthr_code # ambrose records description
NULL 249 not assigned
0 3,402 Cloud development not observed
1 2,865 Clouds generally dissolving or becoming less developed
2 6,524 State of the sky unchanged
3 3,176 Clouds generally forming or developing
4 27 Visibility reduced by smoke
5 2,110 Haze
6 9 Widespread dust in suspension in the air, not raised by wind 
7 3 Dust or sand raised by wind at or near station at time of observation, but no well developed dust or sand whirls or storms
8 3 Well-developed dust or sand whirls seen at or near station during preceding hour or time of observation but no dust or sand storm
9 0 Dust storm or sand storm within sight duringobservation or during preceding hour
10 904 Light fog (visibility 1,100 yards or more)
11 3 Patches of shallow fog or ice fog at the station, not deeper than about 10 meters
12 7 More or less continuous shallow fog or ice fog, not deeper than about 10 meters
13 11 Lightning visible, no thunder heard
14 2 Precipitation within sight, not reaching the surface of the sea
15 5 Precipitation within sight, not reaching the surface of the sea, but more than 5 km. from the ship
16 4 Precipitation within sight, reaching the surface of the sea, near to, but not at the ship
17 0 Thunderstorm, but no precipitation at time of observation
18 3 Squalls at or within sight of the ship during the preceding hour or at the time of observation
19 0 Funnel cloud or water spout at or within sight of the ship during the preceding hour or at time of observation
20 153 Drizzle (not freezing) or snow grains
21 194 Rain (not freezing)
22 34 Snow
23 7 Rain and snow or ice pellets, type(a)
24 2 Freezing drizzle or freezing rain
25 37 Shower(s) of rain
26 5 Shower(s) of snow or of rain and snow
27 3 Shower(s) of hail (ice pellets, type(b), snow pellets), or of rain and hail (ice pellets, type(b), snow pellets)
28 36 Fog or ice fog
29 12 Thunderstorm, with or without precipitation
30 1 Slight or moderate duststorm or sandstaorm has decreased during the preceding hour
40 39 Fog or ice fog at a distance at the time of observation, but not at the ship during the preceding hour, the fog or ice extending to a level above that of the observer
41 29 Fog or ice fog in patches
42 56 Fog or ice fog, sky visible has become thinner during the preceding hour
43 71 Fog or ice fog, sky invisible has become thinner during the preceding hour
44 130 Fog or ice fog, sky visible no appreciable change during the preceding hour
45 333 Fog or ice fog, sky invisible no appreciable change during the preceding hour
46 119 Fog or ice fog, sky visible has begun or has become thicker during the preceding hour
47 203 Fog or ice fog, sky invisible has begun or has become thicker during the preceding hour
50 173 Drizzle, not freezing, intermittent slight at time of observation
51 217 Drizzle, not freezing, continuous slight at time of observation
52 5 Drizzle, not freezing, intermittent moderate at time of observation
53 28 Drizzle, not freezing, continuous moderate at time of observation
54 1 Drizzle, not freezing, intermittent heavy (dense) at time of observation
55 7 Drizzle, not freezing, continuous heavy (dense) at time of observation
56 3 Drizzle, freezing, slight
57 1 Drizzle, freezing, moderate or heavy (dense)
58 15 Drizzle and rain, slight
59 2 Drizzle and rain, moderate or heavy
60 132 Rain, not freezing, intermittent, slight at time of observation
61 261 Rain, not freezing, continuous, slight at time of observation
62 16 Rain, not freezing, intermittent, moderate at time of observation
63 92 Rain, not freezing, continuous, moderate at time of observation
64 10 Rain, not freezing, intermittent, heavy at time of observation
65 32 Rain, not freezing, continuous, heavy at time of observation
66 1 Rain, freezing, slight
67 6 Rain, freezing, moderate or heavy
68 14 Rain or drizzle and snow, slight
69 4 Rain or drizzle and snow, moderate or heavy
70 48 Intermittent fall of snowflakes, slight at time of observation
71 87 Continuous fall of snowflakes, slight at time of observation
72 7 Intermittent fall of snowflakes, moderate at time of observation
73 45 Continuous fall of snowflakes, moderate at time of observation
74 0 Intermittent fall of snowflakes, heavy at time of observation
75 51 Continuous fall of snowflakes, heavy at time of observation
76 0 Ice prisms (with or without fog)
77 9 Snow grains, with or without fog
79 6 Ice pellets, type (a) (sleet US definition)
80 15 Rain shower(s), slight
81 7 Rain shower(s), moderate or heavy
82 1 Rain shower(s), violent
83 3 Shower of rain and snow mixed, slight
84 2 Shower of rain and snow mixed, moderate or heavy
85 12 Snow shower(s), slight
86 2 Snow shower(s), moderate or heavy
87 2 Slight showers of snow or ice pellets, type (b), with or without rain and/or snow mixed 
88 2 Moderate or heavy showers of snow or ice pellets, type (b), with or without rain and/or snow mixed 
90 1 Moderate or heavy showers of hail, with or without rain or rain and snow, slight mixed, not associated with thunder
91 1 Slight rain at time of observation, thunderstorm during preceding hour but not at time of observation
92 2 Moderate or heavy rain at time of observation, thunderstorm during preceding hour but not at time of observation
93 3 Moderate or heavy snow or rain and snow mixed or hail, at time of observation, thunderstorm during preceding hour but not at time of observation
94 2 Slight snow or rain and snow mixed or hail, at time of observation, thunderstorm during preceding hour but not at time of observation
95 4 Thunderstorm, slight or moderate, without hail, but with rain and/or snow at time of observation
97 3 Thunderstorm, heavy, without hail, but with rain and/or snow at time of observation
99 2 Thunderstorm, heavy, with hail at time of observation

Last Updated on 11/18/98
By Kathryn L. Elder