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SYSTEMFORECASTSHINDCASTS
ENSEMBLE SIZE and
START DATES		PRODUCTIONENSEMBLE SIZE and
START DATES		PRODUCTION
ECMWFSystem 4
(CDS system: 4)		51 members start on the 1streal-time15 members start on the 1stfixed dataset

SEAS5
(CDS system: 5)

51 members start on the 1streal-time25 members start on the 1stfixed dataset
Météo-France

System 5
(CDS system: 5)

51 members (a)

   26 start on the first Wednesday after the 19th
   25 start on the first Wednesday after the 12th

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
   25 start on the 25th
   25 start on the 20th

real-time

25 members

   1 starts on the 1st
   12 start on the 25th
   12 start on the 20th

fixed dataset

System 7
(CDS system: 7)

51 members

   1 starts on the 1st
   25 start on the last Thursday of the previous month
   25 start on the penultimate Thursday of the previous month

real-time

25 members

   1 starts on the 1st
   12 start on the last Thursday of the previous month
   12 start on the penultimate Thursday of the previous month

fixed dataset
Met OfficeGloSea5 (b)
(CDS system: 12,13, 14 (d))		2 members start each day
(c)		real-time

7 members on the 1st
7 members on the 9th
7 members on the 17th
7 members on the 25th

on-the-fly

produced around 4-6 weeks in advance

CMCC

SPSv3
(CDS system: 3)

50 members start on the 1streal-time40 members start on the 1stfixed dataset
DWDGCFS2.0
(CDS system: 2)		50 members start on the 1streal-time30 members start on the 1stfixed dataset
NCEP

CFSv2(b)
(CDS system: 2)

4 members start each day

  1 member per start hour: 0, 6, 12, 18

real-time

4 members start every 5 days (e)

   1 member per start hour: 0, 6, 12, 18

fixed dataset

(a) Despite being produced in a lagged mode, the data from Météo-France system 5 forecasting systems is currently encoded and provided in CDS as if all the members were initialized on the 1st.

(b) The production schedule schedules of the Met Office forecasting system doesnwith lagged start dates don't prescribe how to build an ensemble for a specific nominal start date. The following choices are currently in use for the C3S products based on GloSea5 data:
FORECASTS: the most recent 50 members starting on or before the 1st of the month. (NOTE: The data from all the daily members, and not just those 50 used to produce the C3S forecast products, is processed and made available through the CDS)
HINDCASTS: 28 members (7 starting on the 1st of the month and 7 on each of the 9th,17th and 25th of the previous month)(for those forecasting systems can be found within the information about the concept of nominal start date.
(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 complete list of start dates are provided in the description of CFSvs CFSv2 system, section 6. Other relevant information


Anchor
system_keyword
system_keyword

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