Matthieu Chevallier

Matthieu Chevallier is Head of Evaluation at ECMWF, where he leads the Evaluation Section within the Forecast and Services Department.

The mission of the Evaluation Section is to ensure that ECMWF meets the needs of its users and stakeholders by delivering products of the highest quality and maximum impact – across timescales and throughout the Earth system.

Under his leadership, and in close collaboration with other teams and sections across ECMWF, the Evaluation Section delivers:

• Continuous monitoring of the quality and performance of ECMWF’s medium-range, sub-seasonal and seasonal forecasting systems – including physics-based and machine learning-based forecasts, hydrology, atmospheric composition (CAMS), sub-seasonal and seasonal multi-systems (C3S).
• Operational monitoring of observations used in data assimilation.
• Design of ECMWF’s forecast products.
• Climate monitoring products, based on reanalysis and Earth observations (including C3S-WMO European State of the Climate report and C3S ECVs).
• Operational evaluation of Destination Earth Digital Twins.
• Sectorial products and applications leveraging reanalysis, climate projections, and AI.
• ECMWF’s contributions to the Copernicus Emergency Management Service (CEMS) as Computational centres for Floods and Fire forecasts.
• Documentation, user guidance and training on ECMWF products.

Matthieu is deeply involved in engagement with ECMWF’s users, especially weather forecasting and climate services of ECMWF’s Member and Co-operating States. He also serves as ECMWF's focal point for the WMO Integrated Processing and Prediction System (WIPPS), and leads several of ECMWF’s contributions to WMO on forecast verification, products, and observation monitoring.