NIWA is about to go live with its new 18 million dollar super-computer tasked with revolutionising weather forecasting. The Cray XC50 is three huge computers built especially for NIWA by the Seattle-based global supercomputer maker, Cray. NIWA's current supercomputer, FitzRoy, has reached the end of its operating life and cannot keep up with demand. The new model is one of the most advanced super computers in the country. NIWA's general manager of research, Dr Rob Murdoch explains how the new computer will change the way NIWA crunches data, and especially how much more precisely it will predict weather events.