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 also at the level 50 hPa.
| Name | Abbreviation | Unit |
| Geopotential height | gh | gpm |
| Specific humidity | q | kg kg-1 |
| Temperature | t | K |
| U-velocity | u | m s-1 |
| V-velocity | v | m s-1 |
Potential temperature level parameters
The following parameter is available on Theta=320K.
| Name | Abbreviation | Unit |
| Potential vorticity | pv | K m2 kg-1 s-1 |
Potential vorticity level parameters
The following parameters are available on the potential vorticity level 2 PVU.
| Name | Abbreviation | Unit |
| Potential temperature | pt | K |
| U-velocity | u | m s-1 |
| V-velocity | v | m s-1 |
Single levels
The following parameters are available on single levels.
| Name | Abbreviation | Unit | |
|---|---|---|---|
| 1 | 10 meter u-velocity | 10u | m s-1 |
| 2 | 10 meter v-velocity | 10v | m s-1 |
| 3 | Convective available potential energy | cape | J kg-1 |
| 4 | Convective inhibition | ci | J kg-1 |
| 5 | Field capacity | cap | kg m-3 |
| 6 | Land-sea mask | lsm | Proportion |
| 7 | Mean sea level pressure | msl | Pa |
| 8 | Orography | orog | gpm |
| 9 | Skin temperature | skt | K |
| 10 | Snow depth water equivalent | sd | kg m-2 |
| 11 | Snow fall water equivalent | sf | kg m-2 |
| 12 | Soil moisture | sm | kg m-3 |
| 13 | Soil temperature | st | K |
| 14 | Sunshine duration | sund | s |
| 15 | Surface air dew point temperature | 2d | K |
| 16 | Surface air maximum temperature | mx2t6 | K |
| 17 | Surface air minimum temperature | mn2t6 | K |
| 18 | Surface air temperature | 2t | K |
| 19 | Surface pressure | sp | Pa |
| 20 | Time-integrated outgoing long wave radiation | ttr | W m-2 s |
| 21 | Time-integrated surface latent heat flux | slhf | W m-2 s |
| 22 | Time-integrated surface net solar radiation | ssr | W m-2 s |
| 23 | Time-integrated surface net thermal radiation | str | W m-2 s |
| 24 | Time-integrated surface sensible heat flux | sshf | W m-2 s |
| 25 | Total cloud cover | tcc | % |
| 26 | Total column water | tcw | kg m-2 |
| 27 | Total precipitation | tp | kg m-2 |
| 28 | Wilting point | wilt | kg m-3 |