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The following is a description of the pre-operational release of EFAS v5.2, which will be made available from 04 July 2024 in a test phase. EFAS v5.2 is expected to be launched operationally in August 2024. For an overview of other EFAS releases, please see: the EFAS versioning system. 

To test the pre-operational EFAS v5.2 version, you must access the EFAS Stage Platform: https://stage.efas.eu/en

Please submit any feedback you have on EFAS v5.2 updates using the EFAS feedback form: https://european-flood.emergency.copernicus.eu/en/form/feedback

Summary

EFAS v5.2 introduces several minor changes to the system, including:

• Revised Notification criteria for Formal and Informal notifications: 
  
  • Optimised criteria for the issue of Formal and Informal notifications are based on a new methodology for the computation of the total probability of exceedance of the 5 yr RP threshold of the grand ensemble encompassing all Numerical Weather Predictions.
    
  • Improved definition of the area of validity of Formal and Informal notifications.
  • Revised layers in the EFAS Map Viewer: 
    • (a)  5-year exceedence < 48 h and 5-year exceedence > 48 h replaced the layers Flood Probability < 48 h and Flood Probability > 48 h, respectively;
    • (b) Flood probability layer replaced the former Flood probability persistence layer; 
    • (c) Reporting Points pop-up window has been updated to show total probability and grand ensemble.
  • Improved EFAS notifications email to include a link to a preview feature in the Notifications ArchiveDimitar Tasev
  Reporting points alert levels are now based on the new total probability definition. In the points popup window, new total probability tables and combined hydrograph are shown
  • .

• Stations metadata have been updated to better align them with the hydrological data collected by EHDCC.  Cinzia Mazzetti 
• Updated flood protection levels layer using new information in EU member states
• Updated Major Rivers layer derived from 4 different datasets: FAO AQUASTAT, EU hydro, Natural Earth, and GRDC. FAO AQUASTAT is used as the primary source. In the European domain, vectors were replaced with basins information extracted from EU hydro. Natural Earth or GRDC are used in areas for which neither FAO AQUASTAT nor EU hydro dataset provide information. All the datasets were downloaded in 2023; improved visualisation of river network and river names.
  
• Updated documentation on FTP Access

This upgrade of EFAS has no impact on the EFAS modelling results.

Technical details