Appendix Cnws And Wmo Code Tables; Table 25 Internal Weather Types And Supported Nws Codes; Table 26 Wmo Synop Codes (Table 4680, W ) Used By Pwd22/52 - Vaisala PWD22/52 User Manual

Appendix C ________________________________________________NWS and WMO Code Tables
APPENDIX C
NWS AND WMO CODE TABLES
Internal Weather Types
NO PRECIPITATION
PRECIPITATION
DRIZZLE
RAIN
SNOW
SLEET
FREEZING DRIZZLE
FREEZING RAIN
SYNOP Codes
00
04
05
10
Code figures 20 to 25 are used, if precipitation or fog was observed during the preceding hour but not at
the time of observation
20
21
22
23
24
25
The following code figures are used if precipitation or fog is observed at the time of observation
30
31
32
33
34
40
41
42
VAISALA ______________________________________________________________________ 111
Table 25 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 26 WMO SYNOP Codes (Table 4680, W
PWD22/52
Weather Types
Clear
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
Mist
Fog
PRECIPITATION
Drizzle (not freezing) or snow grains
Rain (not freezing)
Snow
Freezing rain or freezing drizzle
FOG
Fog or ice fog, in patches
Fog or ice fog, has become thinner during the past hour
Fog or ice fog, no appreciable change during the past hour
Fog or ice fog, has begun or become thicker during the past hour
PRECIPITATION
Precipitation, slight or moderate
Precipitation, heavy
NWS Codes
C
P
L
R
S
IP
ZL
ZR
W ) Used by
a a