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Table of Contents
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2023

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title15-12-2023 New model from CPTEC added to S2S

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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title10-08-2023 Three ocean parameters removed from KMA model outputs

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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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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title24-03-2023 New JMA fixed reforecast set

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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title07-11-2017 New ISAC fixed reforecast set

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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title08-06-2017 RHMC on-the-fly reforecast change

Since the 8th of July 2017 the RHMC (rums) reforecasts have been produced on Thursdays instead of previous Wednesdays.

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title22-03-2017 JMA model change

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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title22-02-2017 UKMO reforecast system update

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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title20-01-2017 ISAC-CNR starting day change
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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title10-01-2017 KMA forecasts added to S2S database
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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title22-11-2016 ECMWF model change
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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title24-10-2016 UKMO reforecast system update
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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title10-10-2016 Vertical velocity(w) archiving extended in ECMWF outputs
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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title15-09-2016 S2S forecast products

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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title29-06-2016 ECCC forecasts added to S2S database
The both real-time and re-forecast outputs from ECCC model have been archived in S2S database started on January 7, 2016. More information ... here .

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title25-04-2016 UKMO reforecast system change
The UKMO re-forecasts have been extended with 9 more hindcast years (1993-1995 and 2010-2015) since 17 April, 2016. More information ... here.


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title13-04-2016 Météo-France (lfpw) real-time forecast update

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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title31-03-2016 CMA sea-ice cover issue fixed

For more details, please visit the page about Issues with data.

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title06-01-2016 UKMO reforecasts added to S2S database
The on-the-fly produced UKMO re-forecasts have been added to S2S database with the 1st archived date January 1, 2016. More information ... here.


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title05-01-2016 NCEP reforecasts complete
NCEP re-forecasts archiving for the fixed period 1999-2010 was completed. The whole period is now fully available for users.

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title10-12-2015 UKMO real-time forecasts model added to S2S database
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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title04-12-2015 ISAC-CNR model added to S2S database
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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title10-10-2015 Issues with data

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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title06-10-2015 Scripts to help retrieving reforecasts data

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 re-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:
BoM: https://software.ecmwf.int/wiki/display/S2S/BoM+re-forecast+efficient+retrieval
CMA: https://software.ecmwf.int/wiki/display/S2S/CMA+re-forecast+efficient+retrieval

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title06-10-2015 Availability of reforecasts

The web interface to access re-forecasts was opened. The interface is available here.


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title07-09-2015 Météo-France (lfpw) reforecast update

The re-forecast frequency was changed from once to twice per month. More information... here.


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title26-06-2015 HMCR model added to S2S database
The real-time part of HMCR model was added to S2S database. More information ... here.


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title26-06-2015 Météo-France added to S2S database
A new model was added to S2S database. More information ... here.


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title10-06-2015 CMA added to S2S database
A new model was added to S2S database. More information ... here.


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title14-05-2015 ECMWF model upgrade
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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title06-05-2015 S2S database launch at ECMWF

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.