The simulation with PSU/NCAR MM5 model and a diagnostic analysis are made to investigate the development causes of the major influence synoptic system (North China cyclone).

• 并利用中尺度MM5模式对这次暴雨过程的模拟结果进行了诊断分析，探讨了过程中主要影响系统-华北气旋在渤海西岸生成后迅速发展加强的原因。