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This guide is intended to give an outline of structure and use of the ECMWF IFS.  It also aims to show how the high-resolution forecast (HRES), ensemble forecast (ENS), extended range forecast and seasonal forecast models inter-depend and interact.  Links to more detailed descriptions of processes are given, mainly at the end of each section.  Online ECMWF training resources (eLearning) are available to explain aspects of the ECMWF IFS more visually.  Education is a key component of the work at ECMWF and further educational material is available through the web site (e.g Webinars (recordings) , Slidecasts (slides and audio recordings), Tutorials, Training lectures (presentations in PDF))

This guide is associated with IFS cycle Cy47r3 implemented 12 Oct 2021.

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The User Guide is broadly divided into two parts.  Sections 2 to 5 describe the structure of the ECMWF Integrated Forecasting System, while Sections 6 to 11 describe how the IFS may be used to best advantage by forecasters.

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