GRIB-API definition
| Name | Wind direction | Abbreviation | wdir | Unit | degree true | paramId: | 3031 |
UERRA details
| Definition | Wind direction on a height level. |
| Validity | instantaneous |
| Comment |
WMO GRIB2 definition
| Parameter | ||
|---|---|---|
| Discipline | 0 | meteorological products |
| Parameter category | 2 | momentum |
| Parameter number | 0 | wind direction (from which blowing) |
| 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 | value in 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 |
5 Comments
Richard Mladek
In GRIB-API there exists only "Mean wind direction" (paramId 140242) but without WMO definition. Could we reuse this definition with WMO added?
update: NO as it is for wave model
Richard Mladek
Add WMO definition to the already existing paramId 3031
Sebastien Villaume
" wdir" seems fine at first as shortName
however, "w" is also the vertical wind component (u,v,w are the three components). Even if "w wind component direction" does not make sense, it could confuse some users. Well, I don' t know, I' m not the expert.
Sebastien Villaume
anyway, it is already in use so we can not change it, lets proceed.
Shahram Najm: should I open a JIRA issue for this separately?
Shahram Najm
If any decision is made (and I mean really made with the approval of the Gods of DGOV!), then please raise a JIRA issue