The HRES (current horizontal resolution 9km, vertical resolution 137 levels) is a single run forecast model run twice daily giving forecasts to Day15 based on 00UTC and 12UTC data times. The HRES provides a detailed description of future weather and also for 3.5 days at 06UTC and 18UTC.
From the upgrade to IFS (Cy49r1) introduced in 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 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.
High horizontal and vertical resolutions of HRES and ENS bring the benefit of feeding energy from smaller to larger scale features (as happens in the real atmosphere) but with the risk of developing or amplifying spurious small features or suppressing existing ones that should be retained.
HRES is coupled to the Wave model (ECWAM) and to the Dynamic Ocean model (NEMO) and affects development of Tropical Storms.
Definitive information on the ECMWF dissemination schedule and products can be found in the the Catalogue of ECMWF real-time products (ENS: Set 1).
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