Below is a list of all agreed upon parameters. Participating Centers are expected to produce output fields in GRIB2 data format and with consistent units. All units are defined by the WMO in the GRIB2 manual. For more information please refer to Guide to the WMO Table Driven Code Form

Rules for parameter exchanges and GRIB2 encoding can be found  here.

Pressure level parameters

The following parameters are available on eight pressure levels (1000, 925, 850, 700, 500, 300, 250 and 200 hPa) and in addition geopotential height is provided at 50 hPa.

NameAbbreviationUnit
Geopotential heightghgpm
Specific humidityqkg kg-1
TemperaturetK
U-velocityum s-1
V-velocityvm s-1

Potential temperature level parameters

The following parameter is available on Theta=320K.

NameAbbreviationUnit
Potential vorticitypvK m2 kg-1 s-1

Potential vorticity level parameters

The following parameters are available on the potential vorticity level 2 PVU.

NameAbbreviationUnit
Potential temperatureptK
U-velocityum s-1
V-velocityvm s-1

Single levels

The following parameters are available on single levels.

NameAbbreviationUnit
10 meter u-velocity10um s-1
10 meter v-velocity10vm s-1
Convective available potential energycapeJ kg-1
Convective inhibitionciJ kg-1
Field capacitycapkg m-3
Land-sea masklsmProportion
Mean sea level pressuremslPa
Orographyoroggpm
Skin temperaturesktK
Snow depth water equivalentsdkg m-2
Snow fall water equivalentsfkg m-2
Soil moisturesmkg m-3
Soil temperaturestK
Sunshine durationsunds
Surface air dew point temperature2dK
Surface air maximum temperaturemx2t6K
Surface air minimum temperaturemn2t6K
Surface air temperature2tK
Surface pressurespPa
Time-integrated outgoing long wave radiationttrW m-2 s
Time-integrated surface latent heat fluxslhfW m-2 s
Time-integrated surface net solar radiationssrW m-2 s
Time-integrated surface net thermal radiationstrW m-2 s
Time-integrated surface sensible heat fluxsshfW m-2 s
Total cloud covertcc%
Total column watertcwkg m-2
Total precipitationtpkg m-2
Wilting pointwiltkg m-3