Vaisala FD12P - Appendices; NWS Weather Codes; WMO SYNOP Codes

Appendix A _________________________________________NWS and WMO Codes Used in FD12P
VAISALA _______________________________________________________________________ 143
APPENDIX A
NWS AND WMO CODES USED IN
FD12P
The NWS Codes
Table 30 Internal Weather Types, NWS Code
Weather Type Code
No precipitation C
Precipitation P
Drizzle L
Rain R
Snow S
Ice pellets IP
Sleet IP
Hail A
Ice crystals IC
Snow grains SG
Snow pellets SP
Freezing drizzle ZL
Freezing rain ZR
The NWS codes are used with intensity indicator '+' for heavy , '-' for
light, and none (space) for moderate. For example, 'R+' means heavy
rain.
Table 31 WMO SYNOP Codes (4680, W
a
W
a
)
Code Weather type
00 Clear.
04 Haze or smoke, or dust in suspension in the air, visibility equal to or
greater than 1 km.
05 Haze or smoke, or dust in suspension in the air, visibility less than
1 km.
10 Mist.