Early warning systems are vital tools to better prepare and reduce the impacts of weather-related hazards. The European Flood Awareness System (EFAS – www.efas.eu ) aims to support preparatory measures before major flood events strike, particularly in the large trans-national river basins and throughout Europe in general. It provides a wide range of early flood forecasting information to support national and regional authorities and gives a unique overview across Europe and neighbour countries on currently observed and forecasted flood events. EFAS is the first operational European system to monitor and forecast floods across Europe. It became fully operational in 2012 as part of the Copernicus Emergency Management Service.

Like any weather prediction system, EFAS undergoes regular upgrades in order to improve forecast capabilities. Upgrades can include changes to the model, input data, or new products. The most recent upgrade (EFAS 4.0), foreseen to be released on 14 October 2020, includes a completely new model calibration with additional calibration stations and an increase of the model temporal resolution to 6-hourly time steps. A comparison with the current operational EFAS version indicates that the new upgrade will significantly increase hydrologic model performance and flood forecast skill. Furthermore, EFAS 4.0 includes changes to the products available to users such as the new medium-range forecast performance layer, layers describing some hydrological modelling features and upgraded plots showing the modelled discharge at 6-hourly time-step. All detailed information on the release of EFAS 4.0 can be found on the EFAS Wiki1.

https://confluence.ecmwf.int/display/COPSRV/Pre-operational+release%3A+EFAS+v4.0

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