COMPARISON EXPERIMENT OF IMPROVEMENT IN HLAFS OPERATIONAL FORECAST SYSTEM

The main study purpose is to improve the precipitation prediction. Based on the operational limited area forecast model in National Meteorological Center, a simple mixedphase explicit cloud scheme was implanted, in which the freezing of cloud/rain water and melting of snow were considered and the snow as well as super-cooling water was allowed to exist under 0℃ in the model atmosphere, and the horizontal resolution was increased from 0.5o×0.5o to 0.25o×0.25oin latitude and longitude. Depending upon the improved model, the corresponding assimilation system was set up, and comparison experiment was implemented. The verification to precipitation predictions between two schemes with real-time data show that precipitation area predicted by new scheme is better than old scheme obviously, and also, the precipitation intensity in the precipitation central area is strengthened and closed to the observation.