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SYSTEM | FORECASTS | HINDCASTS | |||
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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 | 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 | |
System 7 | 51 members 1 starts on the 1st | real-time | 25 members 1 starts on the 1st | fixed dataset | |
Met Office | GloSea5 (b) (CDS system: 12,13, 14 (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 |
NCEP | CFSv2 | 4 members start each day 1 member per start hour: 0, 6, 12, 18 | real-time | 4 members start every 5 days (e) | fixed dataset |
(a) Despite being produced in a lagged mode, the data from Météo-France system 5 is currently encoded and provided in CDS as if all the members were initialized on the 1st.
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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.
(e) Details of the list of start dates are provided in the description of CFSvs system, section 6. Other relevant information
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