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Description of the upgrade
The IFS Cycle 50r1, will bring major changes to the IFS model and data assimilation system, including among many others:
- New ocean and sea ice models based on NEMO4-SI 3
- Updates of the wave model including: n ew wave interaction with sea ice and ocean currents and revised wave model bathymetry
- Modified Stochastically Perturbed Parametrisation (SPP) configuration to reduce 10-metre wind spread in the ensemble
- New ocean and sea ice ensemble analysis system & outer loop coupling of ocean/sea-ice
- Weak constraint formulation extended to the boundary layer allowing the i ncreased use of T2m observations
After making the high-resolution forecast (HRES) and 'control' member of medium range ensemble forecast (ENS control) identical in IFS Cycle 49r1, , with this model upgrade we will stop producing the current ENS control, and the data stream that was formerly called the HRES will be called ENS control instead.
More detailed information will be made available in the coming weeks.
For any questions, please contact us via the ECMWF Support Portal.
#IFS50r1 #newfcsystem @ECMWF
News
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Initial announcement. |
Resources
Webinars
Introduction to Cycle 50r1 | Verification, products and technical aspects | Data access and format, testing and practicalities |
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15 September 2025, Coming soon! Register here: If you're attending UEF2025, join the presentation in-person in the Tecnopolo di Bologna. | Coming soon! Watch this space! | Coming soon! Watch this space! |
References
- Visible radiances in ECMWF's analysis, ECMWF Newsletter, No 184 - Summer 2025
- Reintroducing the analysis of humidity in the stratosphere, Semane, N., Bonavita, M ., ECMWF Newsletter No 183 - Spring 2025
- Analysing humidity in the stratosphere improves forecasts , ECMWF News item, 23 June 2025
- Solar eclipses in IFS forecasts and (re)analyses , Lopez, P., ECMWF Newsletter No 181 - Autumn 2024
- Introduction of a new ocean and sea-ice model based on NEMO4-SI3, Keeley , S., Mogensen K., Bidlot J.R ., Boussetta S., Alonso Balmaseda, M., Hatfield S., ECMWF Newsletter No 180 - Summer 2024
- ECMWF’s next ensemble reanalysis system for ocean and sea ice: ORAS6 , Zuo, H., Alonso Balmaseda, M., De Boisséson, E., Browne, P., Chrust, M., Keeley, S., Mogensen, K., Pelletier, C., De Rosnay, P., Takakura, T., ECMWF Newsletter No 180 - Summer 2024
- Plans for high-resolution forecast (HRES) and ensemble forecast (ENS) control run , ECMWF In focus item, 5 March 2024
For any questions, please contact us via the ECMWF Support Portal .
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Want to get updates about future IFS cycle upgrades? Join the mailing list To subscribe or unsubscribe, please send an email to forecast_changes-request@lists.ecmwf.int with either subscribe or unsubscribe as Subject. Join our FORUM https://forum.ecmwf.int/ and 'watch' the announcements in IFS, AIFS and OpenIFS category. Follow the LinkedIn channel for users:
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