This layer shows the 24 hour accumulated precipitation as estimated from gauge-adjusted OPERA radar composites from the pan-European OPERA radar rainfall network blended with short range precipitation forecasted by the ECMWF ensemble. This layer is generated at 00 and 12 UTC every day, the values refer to the total accumulated precipitation in the preceding 24 hours.
The layer is generated by summarising all the hourly blended radar and ECMWF forecast data over the previous 24 hours. The blending of the radar and ECMWF data is done at each hour by extracting from the most recently available ECMWF forecast the ensemble member which has the closest match to the radar observation. At locations where radar data are available, the blending gives greatest weight to the radar data, otherwise greater weight is given to the ECMWF data at locations which are further away from radar stations and in areas with no radar coverage.
