A new TAMIR layer introduced with EFAS v4.5. The flash flood impact level forecast for a leadtime of 0-6h near Strasbourg, on the 31st August 2022 at 00 UTC.
A new TAMIR layer introduced with EFAS v4.5. The flash flood impact level forecast for a leadtime of 0-6h near Strasbourg, on the 31st August 2022 at 00 UTC.

The latest version of EFAS v4.5, is to be released operationally on Tuesday 13 September 2022.

EFAS v4.5 introduces minor changes to the system, as well as some general bug fixes. Here is a summary of the main changes:

  • Updates to Post-Processing: Temporal resolution increased from daily to 6-hourly timesteps, where 6-hourly river discharge observations are available for at least two years and in near real-time. Recalibration of all 1606 station models using the most up-to-date data available (1419 at 6-hourly, 187 at daily). A new hydrological database set up by EFAS Hydrological Data Collection Centre (HYDRO) is now used to obtain river discharge observations.

  • Introducing new TAMIR layers with 4 new flash flood products displayed on EFAS-IS: Impact Catchment Summaries (0-120h), Flash Flood Impact Forecasts, Past 24-h Precipitation, Total Precipitation 80th Percentile. These products are produced by the blending of ensemble radar nowcasts from the pan-European OPERA network and the ECMWF ensemble weather forecasts. The products, with the exception of the past 24-h precipitation, are updated every hour with the latest radar information.

For more technical information on the release of EFAS version 4.5 please see the dedicated wiki page following the date of release.