This is a description of EFAS v4.2. For an overview of other EFAS releases, please see: EFAS versioning system


EFAS 4.2 introduces 436 new hydrological river discharge stations provided by partners as fixed reporting points, with amongst them 14 new stations with post-processed medium-range forecasts. The medium-range forecast skill layer was updated to include all fixed reporting point stations. In addition, the legend was improved for some meteorological layers, and additional information introduced in the reporting point layer (especially the persistence criteria used to issue notifications and the persistence table showing the probability for floods to exceed 2-year return period). It also includes general bug fixes.

Here is a a summary of the main changes:

  • 436 new fixed reporting points (now 3087 in total)
  • 14 new points with post-processed medium-range forecasts (now 1200 in total)
  • Improved reporting points pop-up window:
    • Three values of probabilities now shown (2yr/5yr/20yr) together with persistence values (2yr/5yr/20yr)
    • 2-year RP persistency tables now available
  • Upgrade legends in EFAS-IS of some static fields layers
  • Updated legend of ERIC reporting point layer
  • Updated medium-range forecast skill layer

Technical details

Release date2021-02-24 12UTC
In test suite

2021-02-12 12 UTC

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 resolution5 x 5 km
Temporal resolution6-hourly for medium range-monthly products, 24-hourly for seasonal