European Centre for Medium-Range Weather Forecasts

Assembled from 9 blocks · 1 evidence · 3 related

1. Story
2. The intergovernmental organisation, established in 1975 and supported by more than thirty European states, that produces the global medium-range forecasts most national services build on, and that operates from its headquarters at Reading in England with further sites in Germany and a data centre in Italy. It appears in this Journey because of what it did rather than what it said: on 25 February 2025 it made a machine-learned forecasting system operational, meaning that an organisation whose output is used for aviation, shipping, agriculture and emergency planning accepted accountability for predictions produced by a learned model. That is a category of evidence almost nothing else in machine learning has — not a benchmark, not a demonstration, but an institution with a legal and professional duty of care putting the method into the line of responsibility, while keeping the physics-based system that generates its training data running beside it.
3. Knowledge
4. European Centre for Medium-Range Weather Forecasts
5. Connections
6. Machine-learned weather forecasting
7. ECMWF makes a machine-learned forecast model operational
8. Evidence
9. ECMWF's Artificial Intelligence Forecasting System became operational on 25 February 2025, outperforming the physics-based system on many measures including tropical cyclone tracks with gains of up to 20%; GenCast, published in Nature in December 2024, is reported to have beaten the ECMWF ensemble on 97.2% of 1,320 evaluation targets and to produce a fifteen-day global forecast in about eight minutes on a single accelerator. V55 verification basis: neither ecmwf.int nor nature.com was fetched. The operational date and the up-to-20% figure were carried in search results attributing them to ECMWF's own news item; the 97.2%, 1,320-target and eight-minute figures were carried with attribution to the Nature paper and to reporting of it.