stated on the page: ecmwf.int

--- title: ECMWF AIFS summary: ECMWF's Artificial Intelligence Forecasting System: a machine-learned global model run operationally beside IFS, with open outputs and open weights. mount:

Models

Left: what points at it. Right: what it points at. Each line carries its verb; a dashed line was not confirmed on the page cited, or the site does not say; the table below gives the page and the time read for each. From model-ecmwf-aifs.json

--- # ECMWF AIFS > Kept by incident.meteorology@web-summit.dinis, 11 November 2026, 11:36 UTC [Where a forecast comes from](../index.md) · Models · id `model-ecmwf-aifs` · [as data](model-ecmwf-aifs.json) ECMWF's Artificial Intelligence Forecasting System: a machine-learned global model run operationally beside IFS, with open outputs and open weights. **Address:** [https://www.ecmwf.int/en/forecasts/datasets/open-data](https://www.ecmwf.int/en/forecasts/datasets/open-data) (leaves this site) ## What it is connected to, and who says so | This | Verb | That | The page that says so | Read | Check | |---|---|---|---|---|---| | ECMWF AIFS | **is trained on and starts from** | [ECMWF IFS](model-ecmwf-ifs.md) | [huggingface.co](https://huggingface.co/ecmwf/aifs-single-1.0): "neural network (GNN) encoder and decoder, and a sliding window transformer processor, and is trained on ECMWF’s ERA5 re-analysis and ECMWF’s operational numerical weather prediction (NWP) analyses. It has a flexible and " *Trained on ERA5 and on IFS analyses; each run starts from the IFS analysis: a machine-learned model has no observations of its own.* | 11:28 UTC, 11 Nov | stated on the page | | ECMWF AIFS | **is what ECMWF open data carries** | [ECMWF open data](data-ecmwf-open.md) | [ecmwf.int](https://www.ecmwf.int/en/forecasts/datasets/open-data): "Browse the data files Licence: description View licence A subset of ECMWF real-time forecast data from the IFS and AIFS models is made available to the public free of charge. Their use is governed by the Creative Commons" | 11:28 UTC, 11 Nov | stated on the page | | ECMWF AIFS | **redistributed by** | [Open-Meteo](data-open-meteo.md) | [open-meteo.com](https://open-meteo.com/en/docs/ecmwf-api): "transition-none"> ECMWF IFS 0.25° svg]:size-3.5 grid place-content-center text-current transition-none"> ECMWF AIFS 0.25° Single Note: The default Best Match provides the best forecast for any given location worldwide. S" | 11:29 UTC, 11 Nov | stated on the page | | ECMWF AIFS | **run by** | [ECMWF](body-ecmwf.md) | [ecmwf.int](https://www.ecmwf.int/en/forecasts/datasets/open-data): "Browse the data files Licence: description View licence A subset of ECMWF real-time forecast data from the IFS and AIFS models is made available to the public free of charge. Their use is governed by the Creative Commons" | 11:28 UTC, 11 Nov | stated on the page | | ECMWF AIFS | **visualised by** | [MeteoPT](site-meteopt.md) | [meteopt.com](https://www.meteopt.com/): "Comunidade de Meteorologia Português Español English menu_home menu_forum menu_models menu_global GFS ECMWF AIGFS ECMWF-AIFS UKMO ICON ARPÈGE menu_comparator menu_ensemble GEFS ECMWF ENS menu_observation menu_temp menu_s" *The models menu of the community's home page.* | 11:30 UTC, 11 Nov | stated on the page | ## Licence: what we may do with it **ECMWF open data (IFS and AIFS real-time forecasts)**: CC BY 4.0, with ECMWF's Terms of Use ([ecmwf.int](https://www.ecmwf.int/en/forecasts/datasets/open-data), read 11:28 UTC, 11 Nov, stated on the page). | Read | Store | Show | Transform | Attribution | |---|---|---|---|---| | yes | yes | yes, with attribution | yes, with attribution | "Copyright © [year] European Centre for Medium-Range Weather Forecasts (ECMWF)", the source, the licence, and a statement of any change made. | No service guarantee; the open subset is coarser (0.25°) and later than what members receive. **ECMWF AIFS (the trained model itself)**: CC BY 4.0 (model card) ([huggingface.co](https://huggingface.co/ecmwf/aifs-single-1.0), read 11:28 UTC, 11 Nov, stated on the page). | Read | Store | Show | Transform | Attribution | |---|---|---|---|---| | yes | yes | yes, with attribution | yes, with attribution | ECMWF, with the model card cited. | Running it needs the IFS analysis as input (also open data) and a GPU. --- Not a warning service: this page explains where data comes from. For warnings follow [IPMA](https://www.ipma.pt/pt/otempo/prev-sam/) and ANEPC.