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This guide is indended to give an outline of structure and use of ECMWF Integrated Forecast System and 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, but online ECMWF training resources are available to explain aspects of the ECMWF Integrated Forecast Systems more visually.  Education is a key element 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))

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

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