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The HRES (current horizontal resolution 9km, vertical resolution 137 levels) is a single run forecast model run twice daily giving forecasts to Day10 Day15 based on 00UTC and 12UTC data times. The HRES provides a detailed description of future weather . HRES is separate from the medium range ensemble (ENS) and runs slightly earlier. and also for 3.5 days at 06UTC and 18UTC.
From the The horizontal and vertical resolutions of the medium range ensemble (ENS) became the same as for the HRES after the upgrade to IFS (Cy48r1Cy49r1) 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. Autumn 2024, HRES is identical to medium range ensemble (ENS). Both run before the ENS ensemble. The HRES continues for the time being for ease of use by customers and users.
Any On average, HRES is the most accurate single-run realisation of the broadscale weather patterns. But any individual HRES forecast may not be the most skilful compared to ENS member forecasts, and in isolation it cannot provide an estimate of forecast uncertainty or confidence.
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HRES is coupled to the Wave model (ECWAM) and to the Dynamic Ocean model (NEMO) and affects development of Tropical Storms.
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Definitive information on the ECMWF dissemination schedule and products can be found in the the Catalogue of ECMWF real-time products (ENS: Set 1).