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- All accumulations shall start from the beginning of the forecast
- The initial state (forecast step zero) shall be a part of all forecasts, all members, etc.The values of accumulated fields shall be set to zero for t=0must not be included (as it should be 0 value field by definition)
Instantaneous fields
- Instantaneous fields shall be archived with a frequency defined here for each group of parameters and forecast type.
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The additional generally required encoding UERRA details are listed below:
| Section 1 | |||
|---|---|---|---|
| Octets | Key name | Value | Description |
| 6-7 | centre | 78 | COSMO products (code Offenbach edzw) |
| 84 | Meteo-France products (code Toulouse lfpw ) | ||
| 82 | HARMONIE products (code Sweden eswi) | ||
| 74 | MO products (code UK Meteorological Office Exeter egrr) | ||
| 10 | tablesVersion | 17 | latest WMO table with some new definitions for UERRA |
| 20 | productionStatusOfProcessedData | 8 | operational UERRA products |
| 9 | test UERRA products | ||
| 21 | typeOfProcessedData | 0 | Analysis products |
| 1 | Forecast products | ||
Deterministic system (both analysis and 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)) |
| 8 | Analysis and Forecast products (statistically processed = accumulated/min/max values) (Average, accumulation, extreme values or other statistically processed values at a horizontal level or in a horizontal layer in a continuous or non-continuous time interval (grib2/tables/17/4.0.table)) | ||
Ensemble DA system (both analysis and forecast products)
| Section 4 | |||
|---|---|---|---|
| Octets | Key name | Value | Description |
| 8-9 | productDefinitionTemplateNumber | 1
| Analysis and Forecast products (instantaneous) (Individual ensemble forecast, control and perturbed, at a horizontal level or in a horizontal layer at a point in time (grib2/tables/17/4.0.table)) |
| 11 | Analysis and Forecast products (statistically processed = accumulated/min/max values) (Individual ensemble forecast, control and perturbed, at a horizontal level or in a horizontal layer, in a continuous or non-continuous time interval (grib2/tables/17/4.0.table)) | ||
| 35 | type of ensemble forecast | 255 | missing |
| 36 | perturbation number | 2 | Example for 2nd eps member of ensemble with 4 members (0/1/2/3) |
| 37 | number of forecasts in ensemble | 4 | |
Examples of UERRA compliant GRIB2 files
| deterministic | ensemble DA | |||
| AN | FC | AN | FC | |
Accumulations | N/A | N/A | ||
Instantaneous on surface level | ||||
Instantaneous on model level (Specific humidity on model level 1) | ||||
Maximum since previous post-processing (Surface air maximum temperature since previous post-processing) | N/A | grib* | N/A | |
Minimum since previous post-processing (Surface air minimum temperature since previous post-processing) | N/A | N/A | ||
Parameter on soil level (Soil temperature on soil level 1) | ||||
*disregard data values in this grib (some step/level values were created artificially as real data has not been available yet)
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