The WMO LC-SSPMME for sub-seasonal predictions builds on the legacy left by the S2S project (link) and relies on the S2S data base (link). Although the S2S project has completed, several operational and research centres continue to provide their forecast and re-forecast to the S2S archive for at least another 5 years.
The S2S archive confluence page (link) is constantly updated and displays information about the forecast data archived and about the models (link) that have produced iteach contributing model. The S2S forecast is available to the public with a latency of 3 weeks.
...