Description of the upgrade
ECMWF introduced an extra set of product fields in order to address an issue that occurs at day 10 in accumulated fields of the ensemble forecast (ENS). The additional products are available through dissemination under the name Ensemble Forecast Overlap (EFOV).
The issue was caused by the change in ENS horizontal resolution from higher resolution in leg 1 (0 to 240 hours) to lower resolution in leg 2 (246 to 360 hours). The change in resolution creates incorrect values for accumulations that run across day 10, i.e. those that span forecast time steps 240-246 hours.
The full list of ensemble forecast overlap fields available
Further reading
- A comprehensive description of the Ensemble system and its variable resolution (leg 1 and leg 2) can be found in Newsletter 108 (pp 14-20).
Changes in GRIB API
Support for two following parameters was added to GRIB API.
- fdirvar = Total sky direct solar radiation at surface (variable resolution)
- cdirvar = Clear-sky direct solar radiation at surface (variable resolution)
Resolution
Unchanged