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IFS Cycle 50r1 and AIFS v2 successfully implemented on 12th May 2026
As you will probably have seen, IFS Cycle 50r1 and AIFS v2 were successfully implemented on 12th May 2026. We thank all users for their patience during the implementation, as well as all those who tested prior to the implementation date.
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Communicating details of contact information changes
During 50r1the implementation of the models' upgrade, we noticed a number of users had outdated or incorrect contact information that led to issues when implementing the changes. We would like to remind all that it is the responsibility of the user to inform us of any changes to contact details through the following page: Inform us of changes in your contact information.
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Further information is available on the File naming convention and format for real-time data page.
Note that National Meteorological Services of ECMWF Member and Co-operating States will be contacted separately for this topic.
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From 30 April 2026, a freeze period was in place for the Product Requirements Catalogue (PRC) until 50r1 models' upgrade implementation. The PRC is now available again.
Users can browse, calculate costs and arrange a Service Agreement for ECMWF data. For more information, see the documentation.More information about pre-schedule delivery can be found here.
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Pre-schedule delivery updates after IFS Cycle 50r1 implementation
With the implementation of 50r1model upgrade, we updated the production chain to incorporate new parameters and observations. This has increased the overall model run time and the subsequent processing required to generate individual products, which in turn affects the availability timing of pre-scheduled products. We are continuing to refine and tune the system.
We apologise for any inconvenience this may cause, and please be aware that, in general, the timing of pre-scheduling is not guaranteed. Users are reminded that reports of delays should only be raised 15 minutes after the scheduled time has passed.
More information about pre-schedule delivery can be found here.
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Upcoming changes to interfaces
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Additionally, the current Product Requirements Catalogue (PRC Shopping Cart) and Product Requirements Editor (PREd) will be merged into a single unified app. This new application will include revised workflows to enable you to handle your own contact access to services, handle your own renewals, as well as the existing features of both applications. We plan to launch a test version of this application in early July, and we invite users who would like to evaluate the new interface to contact us for early access.
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Upcoming migration to GRIB2 data format
To give users an update on the progress and timeline, we have organised a session at the Using ECMWF's Forecasts Event (UEF2026) next week on Thursday, 4 June 2026 at 10:30 – 11:20 CEST (09:30 – 10:20 BST). This session will be broadcast online, so you can follow along as well!
No need to fully register to follow the session. You can watch as a guest from the following link: https://ecmwfevents.com/i/using-ecmwf-s-forecasts-uef2026/login
More information and the full programme can be found here.
Further information, including where to find the data and a detailed description of the static sample dataset and parameter changes, can be found in the Migration to GRIB edition 2 - Information page.
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If you have any issues, concerns or feedback, we encourage you to contact us via the ECMWF Support Portal.
Best wishes,--
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ECMWF Data Support Team
European Centre for Medium-Range Weather Forecasts
Reading, UK | Bologna, Italy | Bonn, Germany
ECMWF Support Portal | ecmwf.int
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