Detailed model description
Page containing details for all model configurations available in S2S since the project start =>ECMWF model description
Overview of the model changes
| Model version | Implementation Date in S2S | Time range | Atmosphere Resolution | Ens. Size | Frequency | Rfc type | Rfc length | Rfc frequency | Rfc size | Ocean Resolution | Active Sea Ice | Remarks |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CY49R1 | 12/11/2024 | d 0-46 | Tco319L137 (about 32 km) | 101 | daily | on the fly | past 20 years | 1/3/5/7/9/11/13/15/17/ | 11 | 1/4 degree | Yes | CAPE replaced by MUCAPE |
| CY48R1 | 27/06/2023 | d 0-46 | Tco319L137 (about 32 km) | 101 | daily | on the fly | past 20 years | 2/week (Mon/Thu) | 11 | 1/4 degree | Yes | |
| CY47R3 | 13/10/2021 | d 0-46 | Tco639 L137 (about 16 km) up to day 15 and Tco319 (about 32 km) after day 15 | 51 | 2/week (Mon/Thu) | on the fly | past 20 years | 2/week (Mon/Thu) | 11 | 1/4 degree | Yes | |
| CY47R2 | 11/05/2021 | d 0-46 | Tco639 L137 (about 16 km) up to day 15 and Tco319 (about 32 km) after day 15 | 51 | 2/week (Mon/Thu) | on the fly | past 20 years | 2/week (Mon/Thu) | 11 | 1/4 degree | Yes | |
| CY47R1 | 30/06/2020 | d 0-46 | Tco639 L91 (about 16 km) up to day 15 and Tco319 (about 32 km) after day 15 day 15 L91 | 51 | 2/week (Mon/Thu) | on the fly | past 20 years | 2/week (Mon/Thu) | 11 | 1/4 degree | Yes | 6-hourly 10u/v added since |
| CY46R1 | 11/06/2019 | d 0-46 | Tco639 L91 (about 16 km) up to day 15 and Tco319 (about 32 km) after day 15 | 51 | 2/week (Mon/Thu) | on the fly | past 20 years | 2/week (Mon/Thu) | 11 | 1/4 degree | Yes | additional ocean parameters added since 2020/01/02 |
| CY45R1 | 06/06/2018 | d 0-46 | Tco639 L91 (about 16 km) up to day 15 and Tco319 (about 32 km) after day 15 | 51 | 2/week (Mon/Thu) | on the fly | past 20 years | 2/week (Mon/Thu) | 11 | 1/4 degree | Yes | |
| CY43R3 | 11/07/2017 | d 0-46 | Tco639 L91 (about 16 km) up to day 15 and Tco319 (about 32 km) after day 15 | 51 | 2/week (Mon/Thu) | on the fly | past 20 years | 2/week (Mon/Thu) | 11 | 1/4 degree | Yes | |
| CY43R1 | 22/11/2016 | d 0-46 | Tco639 L91 (about 16 km) up to day 15 and Tco319 (about 32 km) after day 15 | 51 | 2/week (Mon/Thu) | on the fly | past 20 years | 2/week (Mon/Thu) | 11 | 1/4 degree | Yes | |
| CY41R2 | 08/03/2016 | d 0-46 | Tco639 L91 (about 16 km) up to day 15 and Tco319 (about 32 km) after day 15 | 51 | 2/week (Mon/Thu) | on the fly | past 20 years | 2/week (Mon/Thu) | 11 | 1 degree | No | |
| CY41R1 | 14/05/2015 | d 0-46 | TL639 L91 (about 32 km) up to day 10 and TL319 (about 64 km) after day 10 | 51 | 2/week Mon/Thu | on the fly | past 20 years | 2/week (Mon/Thu) | 11 | 1 degree | No | |
| CY40R1 | 01/01/2015 | d 0-32 | TL639 L91 (about 32 km) up to day 10 and TL319 (about 64 km) after day 10 | 51 | 2/week (Mon/Thu) | on the fly | past 20 years | once a week (Thu) | 5 | 1 degree | No |
Description of the main changes
For the full details refer to the official IFS documentation
information about planned changes to the IFS forecasting system and documentation describing previous changes can be found in Changes to the forecasting system
CY49r1
The IFS Cycle 49r1, will bring major changes to the IFS model and data assimilation system, including among many others:
- assimilation of 2m temperature observations,
- Land-surface model updates,
- increased resolution and soft-recentering of the ensemble of data assimilations (EDA) and
- activation of the stochastically perturbed parameterisations (SPP) model uncertainty scheme in all ensemble configurations.
Extended-range forecast will change name to sub-seasonal range forecast. This name change will be gradually implemented in the documentation.
The re-forecasts for medium and sub-seasonal forecast systems will see a change in frequency; whilst both will span the past 20 years, as before, they will now be run for fixed days of the month:
- medium range every four days: 1/5/9/13/17/21/25/29 (excluding 29 February)
- sub-seasonal range every two days: 1/3/5/7/9/11/13/15/17/19/21/23/25/27/29/31 (excluding 29 February)
The parameters CAPE (59) and CIN (228001) are discontinued and replaced by MUCAPE (228235) and MUCIN (228236).
CY48R1
- increased eps size to 101 for the real-time forecasts
- the frequency changed to daily for the real-time forecasts since 28/06/2023
- the same horizontal resolution for the atmosphere Tco319L137 (about 32 km) and the whole forecast range
- the first reforecasts run with the new cycle on 29/06/2023
2020/01/02 Addition of ocean parameters
CY43R1
- changes include increased ocean model resolution to 1/4 degree and active sea-ice
- operational since 22/11/2016 (included)
CY41R2
- operational from 8/03/2016 (included) to 22/11/2016 (excluded)
CY41R1
- changes include extension of re-forecast ensemble size to 11 twice-weekly and forecast length to 46 days
- operational from 14/05/2015 (included) to 8/03/2016 (excluded)
CY40R1
- operational before 14/05/2015 (excluded)