Appendix A ________________________________________________ NWS and WMO Code Tables
VAISALA _______________________________________________________________________ 223
APPENDIX A
NWS AND WMO CODE TABLES
Table 51 Internal Weather Types and Supported NWS Codes
NWS codes are used with intensity indicator '+' (plus) for heavy
intensity, '-' (minus) for light, and none (space) for moderate. For
example, 'R+' means heavy rain.
Table 52 WMO SYNOP Codes (Table 4680, W
a
W
a
) Used by
PWD32
Haze or smoke, or dust in suspension in the air,
visibility equal to, or greater than, 1 km
Haze or smoke, or dust in suspension in the air,
visibility less than 1 km
Code figures 20 to 25 are used, if precipitation or fog was observed during the
preceding hour but not at the time of observation
Drizzle (not freezing) or snow grains
Freezing rain or freezing drizzle
The following code figures are used if precipitation or fog is observed at the
time of observation
Fog or ice fog, in patches
Fog or ice fog, has become thinner during the past
hour
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