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On these pages you can find information about planned changes to the IFS forecasting system and documentation describing previous changes. Please note that for planned changes this information is subject to revisions as we proceed with experimentation.

Formal announcements of the implementation schedules for new model cycles will still be made by email, and relevant information will then be posted on dedicated pages on the ECMWF web site, where you can also find information about previous changes to the ECMWF forecasting system.  The terminology used is described in Terminology for IFS testing.

Planned changes

  • TBA

Past changes

Mailing list

A mailing list has been created to inform interested parties about IFS changes.

To subscribe to or unsubscribe, please send an email to

with the word subscribe or unsubscribe as Subject or click subscribe

Alternatively access, enter your email address and click Subscribe

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