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- Bitmaps shall be used to indicate missing values (i.e. Soil temperature (st) shall be coded using a bitmap, because there is no model output over the sea)
Grid and resolution
- The fields have to be provided on a regular latitude‐longitude grid at the resolution that is best matching the native resolution of the direct model output.
- Grids are defined in GRIB2 using an accuracy of 1/1000000 (one millionth) of a degree.
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Specific details which should be encoded in GRIB2 sections 1 and 4:
| Section 1 | |||
|---|---|---|---|
| Octets | Key name | Value | Description |
| 6-7 | centre | X | WMO Centre's code (table below) |
| 8-9 | subCentre | X | |
| WMO Sub-Centre's code if needed (table below) | |||
| 10 | tablesVersion | 19 | The latest WMO table |
| 20 | productionStatusOfProcessedData | 0 |
Production data | ||
| 1 |
| Test data | |||
| 21 | typeOfProcessedData | 0 | Analysis products |
| 1 | Forecast products |
| Section 4 | |||
|---|---|---|---|
| Octets | Key name | Value | Description |
| 8-9 | productDefinitionTemplateNumber | 0 | Analysis and Forecast products (instantaneous) (Analysis or forecast at a horizontal level or in a horizontal layer at a point in time (grib2/tables/17/4.0.table)) |
WMO Centre
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codes
The codes below are based on WMO Manual 306 - WMO Codes
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. Each organization must be uniquely identified by its WMO code. If necessary to distinguish between to organizations using the same WMO code the Sub-Centre one which differs must be provided.
| Organisation | Acronym | WMO Centre | WMO Sub-Centre |
|---|---|---|---|
European Centre for Medium-Range Weather, UK | ECMWF | 98 | N/A |
| Met office, UK | UKMO | 74 | N/A |
| Fleet Numerical Meteorology and Oceanography Center, USA | FNMOC | 58 | N/A |
| Environment and Climate Change Canada, Canada | ECCC | 54 | N/A |
| National Centres for Environmental Prediction, USA | NCEP | 7 | N/A |
| Météo France, France | METFR | 84 | N/A |
| Deutscher Wetterdienst, Germany | DWD | 78 | N/A |
| Bureau of Meteorology, Australia | BoM | 1 | |
| Service Hydrographique et Océanographique de la Marine, France | SHOM | TBD | N/A |
| Japan Meteorological Agency, Japan | JMA | 34 | N/A |
| Korea Meteorological Administration, Republic of Korea | KMA | 40 | N/A |
| Puertos del Estado, Spain | PRTOS | 214 | N/A |
| Danmarks Meteorologiske Institut, Denmark | DMI | 94 | N/A |
National Institute of Water and Atmospheric Research, New Zealand | NIWA | TBD | N/A |
Det Norske Meteorologiske Institutt, Norway | METNO | 88 | N/A |
Servicio de Hidrografía Naval, Servicio Meteorológico, Argentina | SHNSM | 41 | N/A |
New Zealand MetService | NZMS | TBD | N/A |
| Servizio Meteorologico dell'Aeronautica Militare, Italy | METEOAM | TBD | N/A |
Example of the validity type encoding
Instantaneous
This example describes an instantaneous field valid on 20120103 00Z from a forecast starting on 20120101 00Z (time step=48 hours) .
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parameter | Sample file |
|---|---|
10 metre U wind component | WAVE_165.128_1x1.grb2 |
10 metre V wind component | WAVE_166.128_1x1.grb2 |
| Mean wave period based on second moment | WAVE_221.140_1x1.grb2 |
| Mean wave direction | WAVE_230.140_1x1.grb2 |
| Peak wave period | WAVE_231.140_1x1.grb2 |
Significant height of combined wind waves and swell | WAVE_229.140_1x1.grb2 |