Explore the intersection of big data, meteorology, and 21st-century challenges in this comprehensive lecture by Professor Dame Julia Slingo. Delve into the latest developments in Met Office science, uncovering the intricate process of weather forecasting and climate prediction. Learn how the Met Office gathers, analyzes, and creates big data through a fusion of observations, models, and theory. Discover the role of supercomputing infrastructure in performing state-of-the-art simulations that serve as computational laboratories for understanding atmospheric, oceanic, and climate systems. Examine how predictions across various timescales are used to address resilience to weather, climate, and environmental hazards. Gain insights into the importance of interdisciplinary partnerships in tackling the impacts of natural hazards and how advances in simulation, data analytics, and informatics can maximize the societal benefits of weather and climate science.