On this page we provide an overview of sub-seasonal forecast model data downloaded from the S2S Database. The data is downloaded at a 1.5 degree resolution and is freely-available from the ECMWF-hosted sub-seasonal forecast data portal. Throughout the AI Weather Quest, this data will be used to benchmark AI-based sub-seasonal forecasting systems. The following page describes full details regarding the latest model versions including frequency of forecasts/reforecasts and ensemble sizes.
Dynamical forecast/reforecast configuration for AI Weather Quest competition-phase forecast visualisation and evaluation:
WMO Lead Centre Name | ECMWF | Montreal | Washington | Seoul | Tokyo | Beijing | Moscow | Multi-model mean |
|---|---|---|---|---|---|---|---|---|
| Teamname: Modelname on forecast portal | Dynamical_S2SDatabase: ECMWF | Dynamical_S2SDatabase: ECCC | Dynamical_S2SDatabase: NOAA | Dynamical_S2SDatabase: KMA | Dynamical_S2SDatabase: JMA | Dynamical_S2SDatabase: CMA | Dynamical_S2SDatabase: HMCR | Dynamical_S2SDatabase: multimodel_mean |
| Producing/Contributing Centre | ECMWF | Environment and Climate Change Canada | National Oceanic and Atmospheric Administration (NOAA) | Korea Meteorological Administration (KMA) | Japan Meteorological Agency (JMA) | China Meteorological Administration (CMA) | Hydrometeorological Centre of Russia | Averaging probabilities from all dynamical models. |
| MARS catalogue name | ecmf | cwao | kwbc | rksl | rjtd | babj | rums | |
| Webpage describing model description | ECMWF model description | ECCC model description | NCEP model description | HMCR model description | ||||
| Additional information | Forecast initialisation date 20251022 missing so skipped 20251023 start date. | To be added | ||||||
| Forecast selection | ||||||||
| Forecast initialisation date selection | Only forecasts from the initialisation date. | Only forecasts from the initialisation date. | Forecasts from current day and -1 day (i.e. Thursday and Wednesday start date). | Forecasts from current day, -1 day and -2 days (i.e. Thursday, Wednesday and Tuesday start dates). | Forecasts from current day, -1 day & -2 day (i.e. Thursday, Wednesday and Tuesday start dates). | Only forecasts from the initialisation date. | Only forecasts from the initialisation date. | |
| Number of ensemble members (one control plus perturbed). | 101 | 21 | 16 per initialisation date. | 8 per initialisation date. | 5 per initialisation date. | 4 | 41 | |
| Reforecast selection | ||||||||
| Hindcast date selection | < 20241112: select initialisations -3 and 0 days [pre Monday and Thursday]. >= 20241112: if odd day use -2 and 0 days, if an even day use -1 and 1 days [as reforecasts are performed every odd day of month except Feb 29th]. | -3 and 0 days from initialisation date (i.e. previous Monday and the current Thursday) | -4, -2, 0, 2 and 4 days from initialisation date. | Select nearest hindcast date before and after initialisation date (i.e. two dates chosen). | Select nearest hindcast date before and after initialisation date (i.e. two dates chosen). | -3 and 0 days from initialisation date (i.e. previous Monday and the current Thursday) | Single initialisation date | |
| Hindcast years used. | Last 20 years | 2001 - 2020 [20 years] | 1999 - 2010 [12 years] | 1993 - 2016 [24 years] | 1991 - 2020 [30 years] | Last 15 years | 1991 - 2020 [30 years] | |
| Number of hindcast members per initialisation (full number used to compute climatology). | 11 (x 20 years x 2 initialisations = 440) | 4 (x 20 years x 2 initialisations = 160) | 4 (x 12 years x 5 initialisations = 240) | 7 (x 24 years x 2 initialisations = 336) | 5 (x 30 years x 2 initialisations = 300) | 4 (x 15 years x 2 initialisations = 120) | 11 (x 30 years = 330) | |