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2024
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The ECCC model has been upgraded to the new version GEPS 8 since the 11th June 2024 with the main changes related to S2S outputs:
More information can be found in ECCC Model. |
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The new fixed reforecast set (model version date 2023-10-16) was added to S2S archive. More information can be found in CNR-ISAC Model Technical issue affecting occasionally some gridpoints was identified and described in Issues with data |
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After the latest CNRM model change in October 2020, the CNRM grid is inverted, i.e. j-dimension scans positively (south to north) instead of negatively (north to south) as required for the S2S. For more details go to the page Issues with data |
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Four centres CMA, ECCC, ECMWF and RHMC had to figure out how to produce on-the-fly reforecasts for Thursday 29 February 2024. The solution used is described in Issues with data Also the S2S dedicated data portal can help to understand those technical details. |
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ECMWF has reduced the delay in availability of their contribution to S2S database to 48 hours, rather than the previous three-week delay. WMO plans to encourage all data providers to reduce the delay for their contribution. https://www.ecmwf.int/en/about/media-centre/news/2024/ecmwf-releases-much-larger-open-dataset |
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The first fixed reforecast set from CPTEC was added to S2S archive. More information can be found in CPTEC Model. |
2023
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The new model from CPTEC (Brasil) was added to S2S database with the 1st realtime outputs starting on The fixed reforecast set will be added later. More information can be found in: |
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Three of nine newly introduced ocean parameters in KMA model outputs since the last model change on the 1st of July 2023 were problematic and thus discontinued in the archive (since the 9th of August resp the 1th of November 2023 for the realtime resp reforecast data). For more details go to the page Issues with data |
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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:
More details can be found in ECMWF Model and Implementation of IFS Cycle 48r1 |
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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:
More information can be found in KMA Model |
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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. |
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The JMA model has been changed from GEPS to CPS coupled to an ocean model since the 19th February 2023 with the main changes related to S2S outputs:
More information can be found in: |
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The RHMC model has been upgraded to the new version since the 15th September 2022 with the main changes related to S2S outputs:
More information can be found in HMCR Model. |
2022
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There was a problem with the production of the forecast data due to an error in the ocean initial field for the period 29.6.-11.7. 2022. That issue has been resolved now by re-archiving the fixed data. The users are advised to re-download that data if they downloaded it before the 26th July 2022. For more details go to the page Issues with data. |
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After the KMA model upgrade to the version GloSea6 on the 22nd February 2022, there was an issue with Time-integrated top net thermal radiation (too excessive values). That issue has been resolved now by re-archiving the affected data. The users are advised to re-download that parameter if they downloaded it in the period between the 22nd February and the 27th June 2022. For more details go to the page Issues with data. |
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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. |
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The JMA model has been upgraded to the version GEPS2203. It has applied to the real-time forecasts since the 15th 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. |
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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 22nd February 2022 and to the on-the-fly reforecasts one month later since the 25th March 2022 (that inconsistency is newly listed in Issues with data#Inconsistencyinthefirstreal-timeandreforecastrunsarchivedafterKMAmodelupgradetoGloSea6-GC3.2.). All other details can be found in KMA Model. |
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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. |
2021
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The ECCC Global ensemble prediction system (GEPS) has been upgraded to the version 7 since 0Z run on with the main changes:
More details can be found in ECCC model description |
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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 |
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A new model IAP-CAS (Institute of Atmospheric Physics, Chinese Academy of Sciences) was added to S2S database with real-time forecasts back-archived currently since 2021-05-01. The fixed reforecasts will be added in near future. More details can be found in IAP-CAS model description. |
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Since the 1th 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. |
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Yearly statistics have been added to S2S usage statistics. |
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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. |
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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. |
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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 |
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After the recent Meteo-France model upgrade to the version CNRM-CM6, there is an issue with 2 metre minimum and maximum temperature. Both fields contain the mean 2-meter temperature over the past 6 hours instead of the correct values of 2 metre minimum and maximum temperature. This error affects both the real-time data since the real-time forecasts since the 22nd October 2020 and also t he corresponding set of the fixed reforecasts (1993-2017) archived under the model version date 2019-07-01. As this error cannot be easily fixed in the reforecast data, it was decided not to fix for consistency the real-time forecast fields either. For more details go to the page Issues with data. |
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Change of the model version to GEPS2103 has applied to the real-time forecasts since the 30th March 2021. The new JMA real-time ensemble system includes 2 start dates (Tuesdays and Wednesdays at 12Z) instead of the previous 4 runs. The ensemble size is 25 members for both days and the resulting new lagged ensemble for S2S is a single 50-member ensemble starting on Wednesdays at 12Z. The new set of the fixed reforecasts (1981-2020) will be archived later during 2021. M ore information can be found in the pages JMA Model#JGEPS2103 and JMA model description. |
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As a final part of JMA system change from March 2020, the new fixed reforecast set was added to S2S archive. The reforecast frequency was reduced from 3 to 2 runs per month with increased ensemble size from 5 to 13. The new model version date it relates to is 2020-03-31. The new reforecast set should be used together with the real-time runs since 2020-03-25. More information can be found in the JMA Model. |
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The new GloSea6 forecasts and hindcasts have replaced the former GloSea5 system. It has applied to the real-time forecasts since 2nd February 2021 and to the on-the-fly reforecasts since the 1st February 2021. All details can be found in the page UKMO Model . |
2020
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Based on a new project requirement, the frequency of 10m u/v components has been increased to 6-hourly from the previously 24-hourly at the moment in two S2S models CNRM and ECMWF. The Mete-France change is related to the model upgrade to the version CNRM-CM6.1 described below on 22-10-2020. The starting date of this change regarding ECMWF is 12-11-2020 resp. 26-11-2020 for real-time resp. reforecast outputs. The information about the availability of the increased frequency of 10m u/v components is captured in the page Provided parameters. |
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The Meteo-France model has been upgraded to the version CNRM-CM6.1 It has applied to the real-time forecasts since the 22nd October 2020. The corresponding new set of the fixed reforecasts (1993-2017) was also archived under the model version date 2019-07-01 in MARS archive . The most important changes include:
All details can be found in the page CNRM Model . |
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BoM contribution to S2S has been suspended since 25-09-2020 due to technical reasons until further notice. |
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The previously announced (as per below News on 03-07-2020) wrongly encoded CMA reforecasts were fixed and re-archived correctly as of the "on-the-fly" type for the period 2019-11-11...2020-06-22. Further details can be found in Issues with data. |
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Nine additional parameters allowing computing MJO indices were added to the KMA outputs starting since the 1st August 2020 for the real-time forecasts and since the 1st September for the on-the-fly reforecasts. Additionally, six more re-forecast years (2011-2016) have been added to the KMA on-the-fly reforecast outputs also since the run on the 1st of September 2020. More information can be found in the models' description page . |
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Please be informed that there is an ongoing fix of the type of CMA reforecasts for the period 2019-11-11...2020-06-22. Until 2020-06-25 CMA reforecasts were wrongly encoded as of the fixed type. The correct reforecast type is "on-the-fly". This is only a technical fix of GRIB 2 encoding but still users can be affected when reading the data as the encoding changes after 2020-06-25 at the moment. To complete fixing the whole affected period might take couple of weeks. Further details can be found in Issues with data. |
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Update of ECMWF forecast system. A new version of ECMWF model (IFS cycle 47r1) was introduced at ECMWF. This cycle includes changes in the treatment of observations and improvements in the data assimilation and to the model. Quintic vertical interpolation in the semi-Lagrangian advection scheme has been introduced as well as the inclusion of a better surface albedo climatology making use of more data from the MODIS instrument. New Metrics of Tropical Cyclone (TC) “size” will supplement the existing forecasts of TC track and intensity. The processing of the IFS reforecast (run in advance) has been suspended for the July's runs so that they would be computed from tomorrow by the new model version already. Full details can be found in Implementation of IFS Cycle 47r1 page. |
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The ECCC issue with U and V components on pressure levels and at the 10m affecting all outputs (real-time and reforecast) in the period 11.7.2019-9.1.2020 was fixed now. Users should re-download the affected data if they get them before 18 May 2020. For more details go directly to the Issues with data page. |
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The new 9 ocean parameters from CMA coupled model have been back-archived in S2S archive, the real-time runs since 11 November 2019 and the fixed reforecast ones since 2 January 2020 at the moment. The remaining fixed reforecast period 11.11. 2019-30.12. 2020 will be added in the following to have a complete set of those new parameters after the latest CMA model change in November 2019 as per the news item below. The new data is discoverable via the dedicated S2S web data portal under a new level type o2d . |
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Change of the model version to GEPS2003 has applied to the real-time forecasts since the 24th March 2020. The new set of the fixed reforecasts (1981-2010) will be archived later during 2020. The reforecast frequency will be reduced from 3 to 2 per month with increased number of perturbed members from 5 to 13. M ore information can be found in the JMA model description page . |
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The 9 new ocean parameters from ECCC coupled model have been added to S2S archive for both real-time and on-the-fly reforecast runs since 6 Feb 2020 onwards. The new data is discoverable via the dedicated S2S web data portal under a new level type o2d (please be aware of the usual 3 weeks data availability delay because of the S2S archive policy). |
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The 9 new ocean parameters from ECMWF coupled model have been added to S2S archive since 2 Jan 2020 resp. 30 Dec 2019 in case of real-time resp. reforecast outputs. The new data is discoverable as usually via the dedicated S2S web data portal under a new level type o2d . |
2019
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Change of the model version to BCC-CPS-S2Sv1 will apply to real-time forecasts from the 12th November, the frequency changes from daily to 3-daily. The reforecasts type has been changed to the "on-the-fly" for the past 15 years. M ore information can be found in the CMA model description . |
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The page showing data availability of the on-the-fly reforecasts produced currently for S2S archive has been added. |
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The Issues with data page was updated with two newly acknowledged data issues in S2S archive as per below. Please be informed that both issues have already been fixed by 25.6.2019.
For more details go directly to the data issues page. |
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Change of the model version to GloSea5-GC2-LI. The new model will be used for real-time forecasts from the 3rd April and for reforecasts from the run on the 9th of April (the data from April reforecast runs is available in the archive already now as it is produced always well in advance in UKMO case). M ore information can be found in the model's description page . |
2018
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Tropical cyclone tracks computed for all S2S re-forecasts and 3-week behind real-time forecasts are now available from ftp://s2sids:s2sidx@acquisition.ecmwf.int M ore information can be found in the page Tools. |
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One more re-forecast year (2016) has been added to the UKMO on-the-fly re-forecast outputs since the 1st of September 2018. More information can be found in the models' description page . |
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There will be a major event related to S2S archive at ECMWF, 2-5 April 2019: Workshop on Predictability, dynamics and applications research using the TIGGE and S2S ensembles. It is open now for registration and abstract submission. Click here for more details. |
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The re-forecast frequency was changed from two to four times per month (runs on each 1st, 7th, 15th and 22nd day of month) . More information... here . |
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A new page with S2S data usage statistics was added. |
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We have recently experienced a hardware incident with a tape volume becoming damaged:
Unfortunately, requests for data from a damaged tape are blocking access to all S2S data. In order to prevent blocking all S2S service via the WebAPI, we have disabled access to that specific dataset (reforecast, perturbed forecast, pressure level) until the problem is resolved.. We apologise for any inconvenience. As of 19:00 UTC access to all hindcasts has been restored. |
2017
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We have recently experienced a couple of hardware incidents with tape volumes becoming damaged:
Unfortunately, requests for data from damaged tapes were blocking access to all S2S data. In order to prevent blocking all S2S service via the WebAPI, we disabled access to (2) during the specified period. We apologise for any inconvenience. As of 14:30 UTC access to all hindcasts has been restored. |
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New fixed ISAC reforecast set was added to S2S archive. The new model version date it relates to is 2017-06-08. The new reforecasts contain now newly perturbed outputs as well and the lead time has been extended to +32 days. The data availability can be discovered as usually via the dedicated S2S data portal at ECMWF |
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Since the 8th of July 2017 the RHMC (rums) reforecasts have been produced on Thursdays instead of previous Wednesdays. |
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The Meteo-France ssrd field is actually correct. The issue described previously only concerns the French seasonal forecast system but not the S2S one. However there is a newly acknowledged 10-meter wind fields issue - both the zonal and meridian components are effectively wrong. For more details go to the data issues page. |
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New fixed JMA reforecast set was added to S2S archive. The new model version date it relates to is 2017-01-31. Comparing to the previous set of JMA reforecasts (with the preivous model version date 2014-03-04) it has two more year longer reforecast period 1981-2012. The data availability can be discovered as usually via the dedicated S2S data portal at ECMWF . |
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The problems with U/V and geopotential fields (500 hPa and higher levels only) in pressure level outputs from KMA were fixed. The affected data in MARS was re-archived (period between the 29th March and end of August, 2017). For more details, please visit the page about Issues with data. |
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The model outputs from KMA - 500 hPa geopotential fields are wrong since the 29th March, 2017. For more details go directly to the data issues page. |
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The Issues with data page was updated with newly acknowledged data issues in S2S archive:
For more details go directly to the data issues page. |
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The ISAC-CNR real-time forecast length has been increased to 32 days since Thursday, the 8th of June 2017. Further, since the same model run date the vertical speed has been added to all archived pressure levels instead of previous 500 hPa only. |
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The both HMCR runs (real-time and reforecast) are starting now on Thursdays instead of Wednesdays. The 1st affected runs are from Thursday 8th of June 2017. This change was done to facilitate the usage of S2S re-forecasts (to have them starting all on the same week day). |
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The results of the 1st S2S user survey have been published. The total number of 116 users answered various questions about their experience with S2S products. |
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A new version of JMA forecasting system (GEPS1701) has been introduced since the run on 22nd March, 2017. More information... here |
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The number of ensemble members for each hindcast year in UKMO re-forecasts has been increased from 3 to 7. The first affected model run is from the 25th of March, 2017. More information ... here |
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Since the 19th of January 2017 the ISAC-CNR real-time forecast starting date has been changed from Monday to Thursday. The last archived Monday's outputs are from the 16th of January 2017. This change was done to facilitate usage of S2S re-forecasts data where 10 models from 11 have now the starting date on Thursdays. For example it makes possible to produce a multi-model ensemble easily. |
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The both real-time and re-forecast outputs from KMA model have been archived in S2S database starting from the 1st of November, 2016. More information ... here |
2016
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A new ECMWF model version (CY43R1) was released. It affects the ECMWF's outputs for S2S since the Thursday run on the 24th of November. More information ... here |
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The UKMO re-forecasts have been extended backwards to have all available hindcast years(1993 to 2015) since April 17, 2016 already. More information ... here |
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Following S2S steering group recommendation the vertical velocity (w) archiving has been extended in ECMWF real-time and re-forecast outputs from one vertical level (500 hPa) to the same vertical levels as u and v velocity components since October 3, 2016. |
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Following S2S steering group recommendation the vertical velocity (w) archiving has been extended in CMA real-time forecasts from one vertical level (500 hPa) to the same vertical levels as u and v velocity components since September 18, 2016. |
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A new range of near-real time forecast charts based on the Sub-seasonal to Seasonal predictions (S2S) database is now openly available at: www.ecmwf.int/en/research/projects/s2s/charts/s2s They can be used to monitor the S2S data and assess the quality of the forecasts, as well as providing a testbed for the development of new products, for example to identify signals for extreme events at the sub-seasonal timescale. The products include ensemble mean anomalies for some meteorological parameters, Extreme Forecast Index (EFI) for 2m temperature and forecasts of the Madden and Julian Oscillation (MJO). Since S2S is a research project, the forecasts are available with a 3-week delay; they are not intended for operational use. Currently the S2S charts are limited to six models. In future all 11 S2S models will be included and the range of products will be extended | ||||
A new range of near-real time forecast charts based on the Sub-seasonal to Seasonal predictions (S2S) database is now openly available at: www.ecmwf.int/en/research/projects/s2s/charts/s2s They can be used to monitor the S2S data and assess the quality of the forecasts, as well as providing a testbed for the development of new products, for example to identify signals for extreme events at the sub-seasonal timescale. The products include ensemble mean anomalies for some meteorological parameters, Extreme Forecast Index (EFI) for 2m temperature and forecasts of the Madden and Julian Oscillation (MJO). Since S2S is a research project, the forecasts are available with a 3-week delay; they are not intended for operational use. Currently the S2S charts are limited to six models. In future all 11 S2S models will be included and the range of products will be extended. More information will be available ...here. | ||||
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The UKMO reforecasts have been extended with 2 more hindcast years (1993, 1994 and 1995) since August 17, 2016. More information ... here . |
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The both real-time and reforecast re-forecast outputs from ECCC model have been archived in S2S database started on January 7, 2016. More information ... here . |
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The UKMO reforecasts re-forecasts have been extended with 6 9 more hindcast years (1993-1995 and 2010 to -2015) since 17 April 25, 2016. More information ... here. |
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The real-time forecast frequency was changed from once per month to weekly and the length of forecast was changed from 61 to 32 days. The first date archived with this new setup is 3rd March 2016. More information... here. |
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For more details, please visit the page about Issues with data. |
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The on-the-fly produced UKMO reforecasts re-forecasts have been added to S2S database with the 1st archived date January 1, 2016. More information ... here. |
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NCEP reforecasts re-forecasts archiving for the fixed period 1999-2010 was completed. The whole period is now fully available for users. |
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The real-time part of UKMO model outputs started to be archived in S2S database since December 1, 2015. More information ... here. |
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The model outputs from ISAC-CNR were added to S2S database. The 1st available date is November 9, 2015. More information ... here. |
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A page Issues with data was created with the intention to make users aware of important issues with the data. We suggest users to 'Watch' that page so they should get notified of any issue we believe is relevant. More information... here. |
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We have documented a couple of cases on how to write scripts to retrieve data efficiently via the WebAPI. In order to do that one needs to know the frequency and availability of each Centre's reforecastre-forecast. These use cases are linked in the page with models' description (click on the model name in the first column there) For example the links to BoM or CMA use cases are here: |
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The web interface to access reforecasts re-forecasts was opened. The interface is available here. |
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The reforecast re-forecast frequency was changed from once to twice per month. More information... here. |
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The real-time part of HMCR model was added to S2S database. More information ... here. |
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A new model was added to S2S database. More information ... here. |
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A new model was added to S2S database. More information ... here. |
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The major difference for S2S database is the model running frequency change to twice a week and the extension of the forecast length to 46 days. More information ... here |
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The official launch of S2S database Near real-time forecasts from four data providers (BoM, ECMWF, JMA and NCEP) have been ingested routinely since January 2015. More information... here. |