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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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The IFS configurations are:

• the 15-day ensemble control forecast (ex-HRES).  HRES and ensemble control are scientifically, structurally and computationally identical.  HRES output is maintained for the convenience of users but will be withdrawn in a future update cycle.
• the 15-day ensemble forecast (ENS) including the ensemble control forecast (ex-HRES).
• the 46-day sub-seasonal range forecast including the sub-seasonal range control member.
• the 7 or 13 month seasonal forecast.

The ECMWF model output is delivered in the form of charts or GRIB format datasets.  It is readily available to forecasters via:

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ECMWF Newsletters issued quarterly give information on IFS models and applications and ECMWF plans.

A glossary is included in an Appendix 12C.

Section2: The ECMWF Integrated Forecasting System (IFS)

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