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  • ECMWF strategy 2015-2025 is centred on ENS development
  • The horizontal and vertical resolutions of the medium range control member ensemble (CTRLENS) became almost identical to HRES upon the introduction of Cy48r1 in June 2023the same as for the HRES after the upgrade to IFS (Cy48r1) introduced in June 2023.  The HRES forecast and the unperturbed ENS control forecast are meteorologically equivalent and equally skilful on average.  They have the same physical and dynamical representation of the atmosphere and use the same parameterisation of sub-gridscale effects.  However, they can diverge on a day-to-day basis due to small technical differences and the chaotic nature of the atmosphere.  The HRES will continue for the time being for ease of use by customers and users.

Use of the ensemble control member (CTRL)

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