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| Definition | The ratio of the partial pressure of water vapor vapour to the equilibrium vapor vapour pressure of water at the same temperature on a pressure level. |
| Validity | instantaneous |
| Comment |
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GRIB2 definition
| Parameter | ||
|---|---|---|
| Discipline | = 0 | meteorological products |
| Parameter Category | = 1 | moisture |
| Parameter Number | = 1 | relative humidity |
| Level | ||
|---|---|---|
| Type of first fixed surface | = 100 100 | pressure level |
| Scale factor of first fixed surface | = 0 | |
| Scaled value of first fixed surface | = value in Pa | |
| 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 |