A new regional thunderstorm model,coupled with two primary non-inductive electrification mechanisms,namely Takahashi (1978) and Saunders(1991) schemes,is developed based on the newest version of RAMS V6.0.Based on the simulation on a thunderstorm in its early stage which occurred in Beijing,the results show that the total charge distribution is tripolar in both schemes when the electric field reaches breakdown value.The results are in agreement with some observations and results of other model.However,the e...