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Comment: update details for MFs9 and BOM

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Nominal Start DatesC3S multi-system operational components ('system' keyword values)
ECMWFMétéo-FranceUK MetOfficeDWDCMCCNCEPJMAECCCBOM
September 2017 - October 20174512





November 2017 - April 20185512 (1)





May 2018 - October 20185513





November 2018 - April 2019561323



May 2019 - September 20195614 (2)23



October 2019 - April 20205714232


May 2020 - September 20205715232


October 2020571523522

November 2020 - February 20215715213522

March 2021 - April 202157600213522

May 2021 - June 202157600213522

1 and 2


July 2021 - November 202158600213522

1 and 2


December 2021 - January 202258600213522

2 and 3


February 202258600213523

2 and 3


March 2022 - October 202258601213523

2 and 3


November 2022 - Februrary 202351 (3)8601213523

2 and 3


March 2023(4) - February 2024518602213523

2 and 3


March 2024 - June 2024518603213523

2 and 3


July 2024518603
3523

 


August 2024 - February 2025518603213523

4 and 5


March 2025518604213523

4 and 5


April 2025518604223523

4 and 5


May 2025 - present519604223523

4 and 5

2










Legend:

bold fontforecast systems introduced for the first time at the beginning of the nominal start dates range
non-bold fontforecast systems that were excluded from the multi-system at that time

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Info
titleNominal Start Dates

For systems with lagged ensembles having multiple start dates, the "nominal" start date is assigned as follows:

Météo-France (all systems):

  • Forecasts/Hindcasts: nominal month M includes the members initialised in the last weeks of month M-1 and on the 1st of month M

NOTE: Even though the different members of all Météo-France forecasting system ensembles are initialized using a lagged approach, the real start dates are not revealed to the users, so all members are encoded as if they were initialized on the 1st of the month

UK MetOffice (all systems):

  • Forecasts: nominal month M includes the members initialised on the 1st of month M and all available members with start dates back to, and including, the 2nd of month M-1
    • Note that even though just the most recent 50 members are used for C3S products, the complete set of members are available through the CDS
  • Hindcasts: nominal month M includes the members initialised on the 1st of month M and on the 25th, 17th and 9th of month M-1

NCEP:

  • Forecasts: nominal month M includes the members initialised on the 1st of month M and all available members with start dates back to, and including, the 2nd of month M-1
    • Note that even though just the most recent 52 members are used for C3S products, the complete set of members are available through the CDS
  • Hindcasts: nominal month M includes the members initialised on the 1st of month M (if available) and on all start days from month M-1 except the 1st (see table below)
Nominal start monthDates used for C3S productsAdditionally available dates
JANUARY

1 January; 27, 22 and 17 December

12, 7 and 2 December
FEBRUARY31, 26, 21 and 16 January11 and 6 January
MARCH25, 20, 15 and 10 February5 February
APRIL1 April; 27, 22 and 17 March12, 7 and 2 March
MAY1 May; 26, 21 and 16 April11 and 6 April
JUNE31, 26, 21 and 16 May11 and 6 May
JULY30, 25, 20 and 15 June10 and 5 June
AUGUST30, 25, 20 and 15 July10 and 5 July
SEPTEMBER29, 24, 19 and 14 August9 and 4 August
OCTOBER28, 23, 18 and 13 September8 and 3 September
NOVEMBER28, 23, 18 and 13 October8 and 3 October
DECEMBER27, 22, 17 and 12 November7 and 2 November

JMA:

  • Forecasts: nominal month M includes the members initialised on the 1st of month M (if available) and on all start days from month M-1 except the 1st
    • Note that even though only a subset using the most recent members is used for C3S products, the complete set of members is available through the CDS
      • For CPS2 the subset includes 52 members (4 start dates)
      • For CPS3 the subset includes 55 members (11 start dates)
  • Hindcasts: nominal month M includes the members initialised on the 2 available start dates from month M-1

See details about available dates from JMA at section 6 (Other relevant information) of the forecasting system description.

Bureau of Meteorology:

  • Forecasts: nominal month M includes the members initialised on the 1st of month M and on the last 10 days of month M-1
    • Note that even though just the most recent 55 members are used for C3S products, the complete set of members are available through the CDS
  • Hindcasts: nominal month M includes the members initialised on the 1st of month M and on the last 8 days of month M-1
    • Note that for nominal March, both non-leap years and leap years use the same 8 days of February (i.e. 29th February on leap years is not used)


Info

This document has been produced in the context of the Copernicus Climate Change Service (C3S).

The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of C3S on behalf of the European Union (Delegation agreement signed on 11/11/2014). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose.

The users thereof use the information at their sole risk and liability. For the avoidance of all doubt, the European Commission and the European Centre for Medium-Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view.

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