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This edition of the Forecaster User Guide applies to the ECMWF Integrated System (IFS) and meteorological products after autumn 2024 using IFS Cycles 49r1 and later.  We  We are also now starting to add guidance on the AIFS (a data-driven / machine learning model).

With effect from Cy49r1, HRES and Ensemble Control are scientifically, structurally and computationally identical with 9km resolution and their products are known as Control Forecast (ex-HRES).

Note: HRES and Ensemble Control Forecast (ex-HRES) are scientifically, structurally and computationally identical.  With effect from Cy49r1, Ensemble Control Forecast (ex-HRES) output is equivalent to HRES output where shown in the diagrams.   At the time of the diagrams, HRES had resolution of 9km and ensemble members had a resolution of 18km.

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