The following is a description of EFAS v4.5. For an overview of other EFAS releases, please see: EFAS versioning system


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

  • Post-processing updates: 
    • Increase temporal resolution of bias-adjusted method (real-time hydrograph) from 24 hours to 6 hours.
    • Recalibration of all 1608 station models using the most up-to-date data available (1420 at 6-hourly, 188 at daily).
    • River discharge observations are now obtained from a new hydrological database set up by EFAS Hydrological Data Collection Centre (HYDRO)
    • Detailed documentation on the post-processing method and post-processing product (Real-time hydrograph) can be found on the dedicated wiki pages, following the release.

  • Introduction of TAMIR layers:

    • Four new hourly updated flash flood products developed during the TAMIR project are now available:

      • Flash flood impact forecasts summarised at the catchment level for four lead time aggregation windows: 0-6h, 07-24h, 25 - 48h, and 49 - 120h

      • An animated layer showing flash flood impact forecasts over the river network at each timestep for lead times from 0-120h

      • Accumulated precipitation estimates for the past 24h (updated twice per day)

      • An animated layer of the 80th percentile of ensemble rainfall forecasted at each timestep for lead times from 0-120h

    • Detailed documentation on the TAMIR layers can be found on the dedicated TAMIR wiki pages, following the release. 

Technical details

Release date2022-09-13 12UTC
In test suite

2022-07-19 12UTC

EFAS internal release

Archiving of data


Reference climatology (for thresholds/ anomalies)1991-01-01 to 2017-12-31
EFAS Historical1991-01-01 to near present
Horizontal projectionETRS89 Lambert Azimuthal Equal Area Coordinate Reference System (ETRS-LAEA)
Horizontal resolution

5 x 5 km

1 x 1 km for TAMIR products

Temporal resolution

6-hourly for medium range-monthly products, 24-hourly for seasonal

1-hourly for TAMIR products for first 6 hours lead time, 6-hourly thereafter