GRIB-API definition
UERRA details
| Definition | The ratio of the partial pressure of water vapour to the equilibrium vapour pressure of water at the same temperature near the surface. |
| Validity | |
| Comment | Please note that the specific height level above ground might vary from one Centre to another. |
WMO GRIB2 definition
| Parameter | ||
|---|---|---|
| Discipline | 0 | meteorological products |
| Parameter Category | 1 | moisture |
| Parameter Number | 1 | relative humidity |
| Level | ||
|---|---|---|
| Type of first fixed surface | 103 | specified height level above ground (m) |
| Scale factor of first fixed surface | 0 | |
| or 1*** | (m) or (dm***) |
| Scaled value of first fixed surface | 2 |
| or 15*** | 2 / 1.5 m | |
| Type of second fixed surface | all bits to 1 | missing |
| Scale factor of second fixed surface | all bits to 1 | missing |
| Scaled value of second fixed surface | all bits to 1 | missing |
*** option valid for MetOffice