[UPDATED] C3S seasonal forecasts: Planned changes to operational forecast systems

Announcements C3S - Announcements
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[UPDATED on 7/March/2025]

In the coming months several system upgrades are expected from the seasonal forecast providers to C3S. Additionally, we will soon see the incorporation of a new contributor to the C3S multi-system - the Australian Bureau of Meteorology (BoM).

The following dates have been now confirmed:

  • April 2025: DWD’s contribution will be upgraded to a new forecast system version (GCFS2.2)
  • May 2025:
    • BoM’s ACCESS-S2 forecast system will be incorporated into the C3S seasonal forecast activity
    • Météo-France’s contribution will be upgraded to a new forecast system version (System9)

The documentation for these forecast systems has been now published in the corresponding Knowledge Base pages (following the links in the previous paragraph)

Please note that at least on the 10th of the month prior to those release dates, the initial set of hindcast (re-forecast) data will be released in the C3S seasonal forecast datasets on the Climate Data Store.

Decisions on CMCC SPS4 forecast system are still pending. Details will be communicated as soon as they are available.

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