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 GloSea5-GC2:- 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
- 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
NCEP:- 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 at CFSv2 description, section 6below)
- 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
| Nominal start month | Dates used for C3S products | Additionally available dates |
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| JANUARY | 1 January; 27, 22 and 17 December | 12, 7 and 2 December | | FEBRUARY | 31, 26, 21 and 16 January | 11 and 6 January | | MARCH | 25, 20, 15 and 10 February | 5 February | | APRIL | 1 April; 27, 22 and 17 March | 12, 7 and 2 March | | MAY | 1 May; 26, 21 and 16 April | 11 and 6 April | | JUNE | 31, 26, 21 and 16 May | 11 and 6 May | | JULY | 30, 25, 20 and 15 June | 10 and 5 June | | AUGUST | 30, 25, 20 and 15 July | 10 and 5 July | | SEPTEMBER | 29, 24, 19 and 14 August | 9 and 4 August | | OCTOBER | 28, 23, 18 and 13 September | 8 and 3 September | | NOVEMBER | 28, 23, 18 and 13 October | 8 and 3 October | | DECEMBER | 27, 22, 17 and 12 November | 7 and 2 November |
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