In this video, scientists describes IBM GRAF, a powerful new global weather forecasting system that will provide the most accurate local weather forecasts ever seen worldwide. The IBM Global High-Resolution Atmospheric Forecasting System (GRAF) is the first hourly-updating commercial weather system that is able to predict something as small as thunderstorms globally. Compared to existing models, it will provide a nearly 200% improvement in forecasting resolution for much of the globe (from 12 to 3 sq km).