The following is a description of the latest operational release of GloFAS (v4.4), which was launched on 10 September 2025. For an overview of other GloFAS releases, please see: GloFAS versioning system.
Summary
GloFAS v4.4 introduces several minor changes to the system, including:
- Inclusion of ECMWF’s Artificial Intelligence/Integrated Forecasting System (AIFS) model in GloFAS.
- Documentation about the operational release of ECMWF's AIFS model, including information on versions, is available on this dedicated AIFS webpage.
- AIFS Single is added to the ECMWF ensemble hydrograph in GloFAS-IS, without any change in the reporting points calculation: GloFAS Reporting Points
- New AIFS Single layer shows the highest return period exceedance within the 15-day forecast range based on the AIFS single forecast: GloFAS AIFS Single
- New naming convention of NWP forcing
- ECMWF medium-range NWP called IFS ENS, in line with ECMWF's naming convention
- ECMWF control member called IFS CF
This upgrade of GloFAS has no impact on the GloFAS modelling results.
Technical details
| Pre-release date (available onstage platform) | 2025-09-03 |
|---|---|
| Release date | 2025-09-10 |
| In test suite | n/a |
| GloFAS internal number | 005 |
| Archiving of data | ECFS, MARS, CDS |
| Reference climatology (for thresholds/ anomalies) | 1979-01-01 to 2022-12-31 |
| GloFAS Historical | 1979-01-01 to near present |
| Reforecasts | From 2003-03-27 to real time |
| Horizontal projection | EPSG4326 |
| Horizontal resolution | 0.05 x 0.05° |
| Temporal resolution | Daily |