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This edition of the Forecaster User Guide applies to the ECMWF Integrated Forecast System (IFS) and meteorological products after June 2023 using IFS Cycles 48r1 and later.

Table of Contents

Aim of the Forecaster User Guide

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The ECMWF IFS is upgraded at roughly half yearly intervals to incorporate better representation of physical processes and/or higher vertical or horizontal resolution.   New products increasingly aid early warning of severe or hazardous weather.  Information on the latest upgrade is given below.

This guide is intended to give an outline of structure and use of the ECMWF IFS.  It also aims to show how the IFS models inter-depend and interact.

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