We are pleased to confirm the operational implementation of IFS Cycle 50r1, including numerical weather prediction and atmospheric composition (CAMS), as well as AIFS Single v2 and AIFS Ensemble v2 with the
- 06 UTC run on 12 May 2026 (12 UTC for CAMS)
We would like to remind all forecast and data users that this upgrade introduces some significant changes which have the potential to critically impact your processing chains.
Test data has been provided for several months and hopefully you have managed to test your processing chains. The test data will remain available up to 12 May.
Details on the meteorological content and impact, changes to the configuration of the model systems, the introduction of new parameters, availability of test data, etc. can be found on the following pages:
Users of the operational and test product requirements editors , PREd and TPREd, are also reminded that these services have been frozen from Thursday 30 April, ahead of the planned release date on 12 May 2026. The operational PREd will re-open on Wednesday 13 May.
For any enquiries regarding this topic, please contact us via the ECMWF Support Portal (ECMWF login required).
ECMWF Support