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IFS cycle 40r1 was the operational model at ECMWF from 19th November 2013 to 12th May 2015. These release notes describe the differences between OpenIFS 40r1v2 and 40r1v1.1.

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For differences between 40r1v1 and the previous release based on IFS cycle 38, please see the Release Notes for 40r1v1.

Warning

OpenIFS 40r1v2 will not produce the same meteorological results as the previous releases 40r1v1 and 40r1v1.1. A number of changes have been made that mean the model is not bit identical to the previous releases, though the differences are small for medium range forecasts.

For more information on the IFS 40r1 release, see the description of the IFS 40r1, more detailed summary of changes in IFS 40r1 is also available.

Support

Please report any issues or problems with this release to the OpenIFS User Forums or openifs-support@ecmwf.int.

Model documentation

The IFS 40r1 model documentation (PDF manuals) is available from the main ECMWF website.


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