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| SYSTEM | FORECASTS | HINDCASTS | |||
|---|---|---|---|---|---|
| ENSEMBLE SIZE and START DATES | PRODUCTION | ENSEMBLE SIZE and START DATES | PRODUCTION | ||
| ECMWF | System 4 (CDS system: 4) | 51 members start on the 1st | real-time | 15 members start on the 1st | fixed dataset |
SEAS5 | 51 members start on the 1st | real-time | 25 members start on the 1st | fixed dataset | |
| Météo-France | System 5 CDS system: 5) | 51 members (a) 26 start on the first Wednesday after the 19th | real-time | 15 members start on the first Wednesday after the 19th (a) | fixed dataset |
| System 6 (CDS system: 6) | 51 members 1 starts on the 1st | real-time | 25 members 1 starts on the 1st | fixed dataset | |
| Met Office | GloSea5 (b) (bCDS system: 12,13 (d)) | 2 members start each day (c) | real-time | 7 members on the 1st | on-the-fly produced around 4-6 weeks in advance |
| CMCC | SPSv3 | 50 members start on the 1st | real-time | 40 members start on the 1st | fixed dataset |
| DWD | GCFS2.0 (CDS system: 2) | 50 members start on the 1st | real-time | 30 members start on the 1st | fixed dataset |
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(c) Due to the flexibility of the Met Office forecasting system, forecast failures on a given date are not usually recovered by re-running the missed forecasts at a later date, but by running more members with initial conditions of the day of recovery.
Example: An incident affected the 22 August 2017 forecast so no members are available for that date. Instead, 4 members were initialised on 23 August 2017.
(d) 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. Instead, it is just an indexing label that gets changed once per year.
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