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| Definition | The temperature near the surface to which a given air parcel must be cooled at constant pressure and constant water vapor content in order for saturation to occur. |
| Validity | Daily averaged |
| Comment | Computed from instantaneous values at 00, 06, 12 and 18Z. Please note that the specific height level above ground might vary from one Centre to another. The scaled value of first fixed surface given below is the one in usage at ECMWF. |
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| Level | ||
|---|---|---|
| Type of first fixed surface | = 103 | Specified height level above ground m |
| Scale factor of first fixed surface | = 0 | |
| Scaled value of first fixed surface | = 2 | 2 metres (might vary from one centre to another) |
| 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 |
| GRIB 2 |
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| GRIB 2 and C-code for: Perturbed forecast, Control forecast, Perturbed re-forecast and Control re-forecast | |||||||||||||||||||||||||