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Table of Contents
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2023

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title27-06-2023 ECMWF forecast system change

With IFS Cycle 48r1, the horizontal resolution of the  medium-range ensemble  (ENS) will increase from 18 to 9 km. This will bring the ENS to the same horizontal resolution as the high resolution forecast (HRES). The vertical resolution for both ENS and HRES will remain at 137 model levels and the ENS will continue to have 51 members. 

Cycle 48r1 will also bring a major upgrade to the configuration of the  extended-range ensemble  (ENS extended): Rather than being  an extension of the medium-range forecasts starting twice a week at day 15 it will  be a completely separate system, running daily from 00 UTC out to day 46 with 101 members. Over the entire forecast range the resolution will remain unchanged at 36 km horizontally and 137 model levels.

The main changes to S2S contribution from ECMWF are:

  • increased ensemble size to 101 for the real-time forecasts
  • the frequency changed to daily for the real-time forecasts since 28/06/2023
  • the same horizontal resolution for the atmosphere Tco319L137 during the whole forecast range
  • the first on-the-fly reforecasts run with the new cycle on 29/06/2023

More details can be found in ECMWF Model and Implementation of IFS Cycle 48r1


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title01-06-2023 KMA system change

The KMA model has been changed since the 1th June resp since the 17th August 2023 for the real-time resp reforecast ouputs with the main changes related to S2S:

  • eps size of the real-time forecasts increased from 4 to 8
  • eps size of the on-the-fly reforecasts increased from 3 to 7
  • 9 ocean parameters added as per Provided parameters

More information can be found in KMA Model.

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title13-10-2021 ECMWF forecast system change

New version of ECMWF IFS model (cycle 47r3) has been introduced at ECMWF since 6Z run on 202112-10-122021. 

Cycle upgrade 47r3 will bring improvements to the assimilation and observations usage and a significantly improved physical basis for moist processes, necessary to facilitate further development of the Integrated Forecasting System (IFS) and future application at convection-permitting resolutions.

More details can be found in: in 

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title12-05-2021 ECMWF forecast system change

New version of ECMWF IFS model (cycle 47r2) has been introduced at ECMWF since 202111-05-112021.   In the IFS Cycle 47r2 single-precision for ENS (forecast up to day 46 and hindcast) and HRES (forecast) has been introduced. Moreover, the ENS vertical levels has been increased to 137 to bring it in line with HRES.

The processing of the IFS reforecasts, available for S2S as well, from 202113-05-13 2021 (run in advance) has been suspended so that they would be computed from today by the new model version. 

Full details can be found in Implementation of IFS Cycle 47r2

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