Dear all, I am currently downloading data from the S2S real-time dataset : ECMWF | S2S, ECMWF, Realtime, Daily averaged Until very recently, my requests were processed almost immediately. However, since yesterday (around 25–26 March 2026), all submissions have been remaining in the queue for a ve…

Hi @Peng_Lu , ECMWF were receiving a lot of ‘long-running’ requests which slowed things down. This has now been resolved and you should be able to access S2S data easily. Sorry for the inconvenience, Josh

Issue is known and being investigated internally.

The S2S global data is available from new interface Catalogue — ECMWF Data Store , S2S global sub-seasonal to seasonal ensemble real-time forecasts from multiple NWP and research centres since 2015

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Significant Delays in S2S Data Retrieval via Web API — Related to Transition to New Interface?

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Peng_Lu 27 March 2026 13:26 4

Hi Josh,

Thanks for the update and for resolving the issue. Much appreciated!

Best regards,
Peng

Difference between S2S data sources, how the weekly forecast is different if the S2S is only one monthly run