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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

Past changes




Mailing list

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

To subscribe or unsubscribe, please send an email to

forecast_changes-request@lists.ecmwf.int

with either subscribe or unsubscribe as Subject. 

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