The OpenIFS model is based on the ECMWF operational Integrated Forecast System (IFS). It is identical to IFS in forecast capability, the difference is the data assimilation and observation handling capability is not available.

This user guide covers a brief description of the installation and use of the 3D global forecasting model and the Single-Column Model of OpenIFS 48r1 at model version 48R1.1. It does not deal in detail with the scientific and technical formulation of the model. Such information is available in the references listed in the OpenIFS Documentation section of the OpenIFS website.