Numerical Simulation and Analysis of a Heavy Rainfall in Wenzhou

The WRF numerical model does not been used in difficult terrain frequently,especialy in Wenzhou the southern mountain of Zhejiang province.The WRF model has been used to simulate an heavy rainfall in the Wenzhou area during 13-14 May 2010,and analysis the output data of this model.The output data proved that The WRF model simulated spatial and temporal characteristics of this heavy rainfall perfectly,but still have excessive precipitation in some region and heavy rainfall deviation error,the results show that: the upward motion of the center of the rainstorm and low-level convergence and upper level divergence configuration is conducive to the development of mesoscale convective systems,Low Level Jets and High Level Jets coupling is key element of the rainstorm.The rainstorm area humidity energetic environment to maintain,guarantee rainstorm process of energy transfer,the rainstorm continued.The rainstorm center is located in the largest vertical speed area,near the center of the rainstorm area exists on both sides of the vertical secondary circulation conducive to causing intense upward motion.