NWS codes are used with an intensity indicator: ‘+’ (plus) for heavy intensity, ‘-‘ (minus) for light and none (space) for moderate. For example, ‘R+’ means heavy rain.
The National Weather Service (NWS) codes reported by the Campbell Scientific Present Weather Sensor are as follows:
Weather type: NWS code
No precipitation: C
Precipitation: P
Drizzle: L
Rain: R
Snow: S
Ice pellets: IP
Freezing drizzle: ZL
Freezing rain: ZR
Graupel: SP
Snow grains: SG
Ice crystals: IC
