The Integrated Forecasting System (IFS) is a global numerical weather prediction system jointly developed and maintained by the European Centre for Medium-Range Weather Forecasts (ECMWF) based in Reading, England, and Météo-France based in Toulouse.
[4] ECMWF forecasts are free to the national weather services of its member states, but a fee is charged to commercial users, while limited operational data (select variables from the HRES and ENS out ten days) is available direct to consumers under the noncommercial Creative Commons license prohibiting derivative works (CC-BY ND NC).
[5] In contrast to the international organization's forecast, the output of many national weather services is usually freely licensed to all users.
The full IFS source code is available only to the national weather services of ECMWF member states,.
[1] The source code for the atmosphere model is available to other non-commercial users in the form of the OpenIFS which requires a free license.