The first fixed reforecast set from CPTEC was added to S2S archive. More information can be found in CPTEC Model.

The new model from CPTEC (Brasil) was added to S2S database with the 1^st realtime outputs starting on 13 Dec 2023  The fixed reforecast set will be added later.

 More information can be found in:

• CPTEC Model
• Provided parameters
• Data portal
• S2S history page tracking the data availability

Three of nine newly introduced ocean parameters in KMA model outputs since the last model change  on the 1^st of July 2023 were problematic and thus discontinued in the archive (since the 9^th of August resp the 1^th of November 2023 for the realtime resp reforecast data).

For more details go to the page  Issues with data

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

The KMA model has been changed since the 1^th June resp since the 17^th 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

The new fixed reforecast set (model version date 2022-09-30) related to the upgraded JMA model version CPS was added to S2S archive.  More information can be found in the JMA Model.

The JMA model has been changed from GEPS to CPS coupled to an ocean model since the 19^th February 2023  with the main changes related to S2S outputs:

• General changes:
  
  • output frequency for 10 metre wind and precipitation changed from 24 to 6-hourly
  • increased number of vertical layers for  vertical velocity
  • surface thermal radiation downwards parameter newly provided
• Real-time forecasts changes:
  • ensemble size decreased from 25 to 5
  • frequency changed from twice a week (every Tuesday and Wednesday at 12Z) to every day (0Z)
• Reforecasts changes (the new corresponding fixed reforecast set with model version date 30/09/2022 will be added in the near future):
  
  • ensemble size decreased from 13 to 5
  • the start dates changes as per JMA Model#CPS3

More information can be found in:

• JMA Model
  • JMA model detailed description
• Provided parameters
• S2S Models

The RHMC model has been upgraded to the new version since the 15^th September 2022  with the main changes related to S2S outputs:

• resolution increased from 1.1x1.4 L28 to 0.9x0.72 L96 
• eps size of the real-time forecasts increased from 20 to 41
• forecast length decreased from d 0-61 to d 0-46
• eps size of the on-the-fly reforecasts increased from 10 to 11
• reforecast period changed from 1990-2015 to 1991-2015
• added 6-hourly 10u/v parameters 
• added 10 hPa pressure level parameters

More information can be found in HMCR Model.

For more details go to the page  Issues with data.

For more details go to the page Issues with data.

The new fixed reforecast set (model version date 2022-03-31) related to the upgraded JMA model version GEPS2203 was added to S2S archive.  More information can be found in the JMA Model.

The JMA model has been upgraded to the version GEPS2203. It has applied  to the real-time forecasts since the 15^th March 2022.  The new set of the fixed reforecasts (period 1991-2020 with the model version date 2022-03-31) should be fully archived during the next two weeks. More information can be found in the pages JMA Model#JGEPS2203 and  JMA model description.

The new KMA model version (based on GloSea6)  has replaced the former one (based on GloSea5). It has  applied  to the real-time forecasts since 22^nd February 2022 and to the on-the-fly reforecasts one month later since  the 25^th March 2022 (that inconsistency is newly listed in Issues with data#Inconsistencyinthefirstreal-timeandreforecastrunsarchivedafterKMAmodelupgradetoGloSea6-GC3.2.). 

 All other details can be found in KMA Model.

The first fixed reforecast set complementary to the recently added new model from IAP-CAS  is now available for the period 1999-2018 (Model version date 2019-01-01). One parameter (2 metre dewpoint temperature) is available for the limited period 2006-2018 as per Issues with data. More details can be found in IAP-CAS model description.

The ECCC Global ensemble prediction system (GEPS) has been upgraded to the version 7  since 0Z run on 02 Dec 2021 with the main changes:

• The version of the GEM model is upgraded to 5.1 with more advanced physics.
• The number of vertical levels is increased from 81 to 85 for the data assimilation and from 45 to 85 for the forecast.
• A Stochastic Parameter Perturbation (SPP) method is introduced to replace the Physics Tendency Perturbation (PTP).
• 20 years hindcast period changed from 1997-2017 to 2001 to 2020 from09 Dec 2021 

More details can be found in ECCC model description

New version of ECMWF IFS model (cycle 47r3) has been introduced at ECMWF since 6Z run on 12-10-2021. 

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 

• Implementation of IFS Cycle 47r3
• https://www.ecmwf.int/en/publications/ifs-documentation
• S2S Models

Since the 1^th of July 2021 the RHMC (rums) reforecasts period has changed from 1985-2010 to 1990-2015 as per the model change overview in HMCR Model.

Yearly statistics have been added to S2S usage statistics.

As a final part of JMA model update to the version GEPS2103 from March 2021, the new fixed reforecast set was added to S2S archive. The new model version date it relates to is 2021-03-31. The new reforecast set should be used together with the real-time runs since 2021-03-30.  More information can be found in the JMA Model.

S2S documentation pages have been redesigned and updated to help users better understanding of model configurations and their changes since the project start. The main table in Models has now a feature Expand/collapse the table allowing quick overview of each model major changes impacting products for S2S. Also separate pages dedicated to each model have been updated so that users could identify model change to its previous version more easily. Complete overview of all model configurations since S2S project start should hopefully help users also to define their data retrievals for extended period of time and in more efficient way too.

New version of ECMWF IFS model (cycle 47r2) has been introduced at ECMWF since 11-05-2021. 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 13-05-2021 (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