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The complete WMO compliant GRIB2 definitions of all wave parameters are linked in the page Wave verification
General encoding details
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| width | 50% |
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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 | Centre's code ( |
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| table below) | |||
| 8-9 | subCentre | X | If centre is not sufficient ( |
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| table below) | |||
| 10 | tablesVersion | 19 | latest WMO table |
| 20 | productionStatusOfProcessedData | 0 | Operational products |
| 1 | Operational test products | ||
| 21 | typeOfProcessedData | 1 | Forecast products |
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| 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)) |
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Centre codes (WMO Manual 306 - WMO Codes)
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| Organisation | Acronym |
|---|
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| WMO Centre | WMO Sub-Centre |
|---|---|
European Centre for Medium-Range Weather, UK | ECMWF |
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| 98 |
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| N/A |
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ECMWF (RSMC)
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| Met office, UK | UKMO |
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| 74 | N/A |
| Fleet Numerical Meteorology and Oceanography |
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| Center, USA | FNMOC |
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| 58 | N/A |
| Environment and Climate Change Canada, Canada | ECCC |
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| 54 |
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| N/A |
| National Centres for Environmental Prediction, USA | NCEP |
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| 7 |
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| N/A |
| Météo France, France | METFR |
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| 84 |
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| N/A |
| Deutscher Wetterdienst, Germany | DWD |
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| 78 |
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| N/A | |
| Bureau of Meteorology, Australia | BoM |
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| 1 |
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| Service Hydrographique et Océanographique de la Marine, France | SHOM |
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| TBD |
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| N/A | |
| Japan Meteorological Agency, Japan | JMA |
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| 34 |
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| N/A | |
| Korea Meteorological Administration, Republic of Korea | KMA |
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| 40 |
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| N/A | |
| Puertos del Estado, Spain | PRTOS |
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| 214 | N/A |
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| Danmarks Meteorologiske Institut, Denmark | DMI |
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| 94 |
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| N/A |
National Institute of Water |
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and Atmospheric Research, New Zealand | NIWA |
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| TBD |
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| N/A |
Det Norske Meteorologiske Institutt, Norway | METNO |
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| 88 |
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| N/A | |
Servicio de Hidrografía Naval, Servicio Meteorológico, Argentina | SHNSM |
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| 41 |
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| N/A |
New Zealand MetService | NZMS |
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| TBD |
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| N/A | |
| Servizio Meteorologico dell'Aeronautica Militare, Italy | METEOAM |
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nazdar
| TBD | N/A |
Value
Description
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))Example of the validity type encoding
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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| Time ( instantaneous ) | ||||
|---|---|---|---|---|
| Start of forecast ( section 1 ) | ||||
Octets | values | Meaning of values | Grib_api values | |
| 12 | Significance of Reference Time | 1 | Start of forecast | |
| 13-14 | Year (four digits) | 2012 | year of start of forecast |
dataDate=20120101 dataTime=0 |
| 15 | Month | 01 | month of start of forecast | |
| 16 | Day | 01 | day of start of forecast | |
| 17 | Hour | 00 | hour of start of forecast | |
| section 4 e.g. template 4.1 | ||||
| 18 | Indicator of unit of time range | 1 | Hour | |
| 19-22 | Forecast time | 48 | Forecast step | stepType=instant, step=48 |
Examples of the required GRIB2 files
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 |
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