Abstract
The effect of updraft to precipitation processes is investigated numerically. We use the numerical simulation model which has detailed cloud microphysics and represents cold rain processes. We recognize that the relationship between updraft and rainfall amount is not monotonous. This relationship is explained by referring the results of simulation that the hail occasion is important for heavy rainfall. We supporse that there is suitable updraft strength to cause heavy rainfall and that heavier updraft does not cause heavier rainfall. This supposiotion is qualitatively confirmed through comparison with rain gage data at Gozaisho-yama, Shiga Prefecture.
