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Such unavailability is due to different reasons: some forecast systems produce their hindcasts on-the-fly close to the time when it is released the real-time forecast they go with; some others have been recently introduced in production and not all nominal star dates have been either run by their producing centre or processed and archived by C3S; and also there is a small list of forecast systems that were discontinued before all their start dates were processed by C3S.
| Nominal start date (operational systems) | Météo-France | Met Office(a) | DWD | BOM | Nominal start date (discontinued systems) | ECMWF | Met Office (a) | ECCC |
|---|---|---|---|---|---|---|---|---|
| System 9 (system=9) | GloSea6 (system=604) | GCFS2.2 (system=22) | ACCESS-S2 (system=2) | System 4 (system=4) | GloSea5-GC2-LI (system=15) | GEM-NEMO (system=1) | ||
| January |  | | | | January | |  (c) | |
| February | | | | | February | | | |
| March | | | | | March | | | |
| April | | | | | April | | | |
| May | | | | | May | | | |
| June | | | | * | June | | | |
| July | | | | | July | | | |
| August | | | | | August | | | |
| September | | | | | September | | | |
| October | | | | | October | | | |
| November | | | | | November | | | |
| December | | | | | December | | | |
Complete set of start dates
| Expand | ||||||||||||||||||
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(a)For the Met Office contribution, due to the production of hindcasts "on-the-fly", the CDS keyword 'system' does not have the same meaning as for the other contributors. More details here.
(b) Due to technical reasons, a new version of ECMWF SEAS5 data has been created using the keyword system=51. See details on Announcements (date 12/October/2022)
(c) Hindcast data for January 1993 is not available from MetOffice forecast systems (see "known issue" G4 on the data gaps section)
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