WEATHER FORECASTING ON PARALLEL ARCHITECTURES

Global forecasting at the National Meteorological Center is performed using a spherical harmonics spectral model. The model is used in globa l data assimilation, and in the aviation and medium range forecast pro duction suites. In this presentation, the major numerical and physical aspects of the model are highlighted, and parallelization considerati ons are analyzed and applied to three parallel computer architectures. The first parallelization is on a parallel vector processor shared me mory platform such as Gray YMP or C90. The other two are on distribute d memory platforms: a data parallel implementation on Connection Machi nes and a single program multiple data (SPMD) adaptation to a Gray T3D machine.