(GitHub: https://github.com/google-deepmind/graphcast) GraphCast, an AI model for weather forecasting, delivers 10-day predictions with unprecedented accuracy in under one minute. The model offers earlier warnings of extreme weather events, predicts cyclone tracks, identifies atmospheric rivers, and forecasts extreme temperatures. GraphCast's open-sourced code allows scientists and forecasters worldwide to benefit from its accurate and efficient forecasts, benefiting billions of people.