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Specific details which should be encoded in GRIB2 sections 1 and 4:
| Section 1 | ||||
|---|---|---|---|---|
| Octets | Key name | Value | Description | Comments |
| 6-7 | centre | X | WMO Centre's code (table below) | |
| 8-9 | subCentre | 0 | WMO Sub-Centre's code if needed (table below) | |
| 10 | tablesVersion | 35 | The latest WMO table*1 | |
| 20 | productionStatusOfProcessedData | 14 | Lead Centre for Global Climate Reanalyses *2 | To use during production phase |
| 15 | Lead Centre for Global Climate Reanalyses test *2 | To use during testing phase | ||
| 21 | typeOfProcessedData | 0 | Analysis products | |
| 1 | Forecast products | |||
*1 New WMO tables version 35 (containing also new LC-GCR keys) will be officialy released by WMO later in 2025 (May-June)
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- sample files ecmf.*.grib2 files come from ECMWF's IFS model (data based on the current ERA5)
- ecCodes Version 2.40.0 should be used to display correctly some LC-GCR related meta data
- currently it supports mainly centre=ecmf
- support for other participating models (centre=babj/rjtd/kwbc/nasa) can be added only once we understand full details, how reanalyses are produced by the providers
- exact encoding of time ranges will differ for different models depending on how daily sums are constructed etc
- for example following applies to ERA5:
- Analysis are produced 1-hourly for 0-23h
- Average accumulations within a particular day=date are the average from the following forecasts:
- date-1 18UTC, step=7/to/12/by/1
- date 06UTC, step=1/to/12/by 1
- date 18UTC step=1/to/6/by/1
- for example following applies to ERA5:
- exact encoding of time ranges will differ for different models depending on how daily sums are constructed etc
- support for other participating models (centre=babj/rjtd/kwbc/nasa) can be added only once we understand full details, how reanalyses are produced by the providers
- currently it supports mainly centre=ecmf
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