NUMERICAL SIMULATION OF THE HAIL CLOUD OVER MOUNTAINOUS TERRAIN

A hail cloud model that is two dimensional elastic non hydrostatic, uses a terrain following coordinate system and includes double parameters for ice phase microphysics, has been developed. Numerical experiments were performed using the observed data under different domains of the initial potential temperature perturbation over symmetric mountainous terrain. The results show that the hail cloud which domain of the initial potential temperature perturbation is located inwindward slope and top of mountain is weak,but stronger in lee slope and plain. The hail fall of the hail cloud which domain of the initial potential temperature perturbation is located in lee slope is 6 times as large as in windward slope. The hail cloud over the mountainous terrain may be effected by the air flow of middle layer over the mountainous terrain and the microphysical processes of the hail cloud.