Numerical Simulation and Diagnostic Analysis of a Local Rainstorm Process

Mesoscale numerical model MM5(V3) is used to simulate the heavy rain process in Qidong,Jiangsu Province during 15th to 16th August 2002.Simulated results show that the genesis,development and rain gush of the mesoscale system are well described.The mesoscale vortex,and local circulation are analyzed,and the analysis results demonstrate that the mesoscale vortex played an import role in the occurrence of the heavy rain,and the presence of local circulation also favored the heavy rain.