Weather is difficult to predict even with the help of the latest in forecasting technology. But an accurate weather outlook is crucial for air traffic management. As such, meteorological forecast uncertainty should be included in the decision-making process. The EU-funded FMP-Met project will develop a multi-sector, multi-source convective weather information application for flow management position (FMP). The aim is to provide the FMP with an intuitive and interpretable probabilistic assessment of the impact of convective weather on operations, up to 8 hours in advance. The overall goal of the project is to improve decision-making in traffic flow management, which will ultimately reduce flight delays and improve passenger journeys.