Abstract
A two-dimensional, slab-symmetric time-dependent cloud model was used to investigate precipitation formation in a severe thunderstorm, observed during the MIST project on 20 July 1986. A bulk microphysics technique is applied in the model. Wet and dry growth of the hailstones is simulated by calculating mean hailstone temperature. The model reproduces well the life cycle of the thunderstorm. The simulation supports the assumption that the hailstones formed from frozen water drops, and the explosive growth of the cloud was caused by the release of latent heat of fusion. The model results (e.g., the duration and the region of the embryo formation) are interpreted from the point of view of hail suppression. The simulation shows that the ice particles (cloud ice and snow) play important roles in hailstone formation in warm base thunderstorms.
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