WeatherNext is an AI model that achieves state-of-the-art accuracy in predicting a cyclone's track, intensity, and wind structure. The model gives forecasters, on average, an extra day's worth of predictive accuracy compared to current methods. Google has open-sourced its WeatherNext 2 and WeatherNext Cyclones models to empower the research community and amplify AI's impact on building more resilient communities. The research has already had real-world impact - it predicted Hurricane Melissa's rapid intensification and landfall in Jamaica during the 2025 hurricane season, enabling advanced warnings to be issued and giving teams on the ground critical time to prepare.