Comparative Analysis on Physical Quantity Diagnosis and Wind Profile Radar Data of Two Heavy Rainfalls

[Objective] The research aimed to contrast physical quantity diagnosis and wind profile radar data of two heavy rainfalls. [Method] From circulation background,physical quantity field and wind profile radar data,we analyzed two big rainstorm weather processes ( 8-9 July and August 10) in Lianyungang City in 2012. [Result] Rainstorm generation was related to favorable large-scale circulation situation. The first-stage precipitation during 8-9 July was warm-zone precipitation,and the precipitation at the second stage was triggered by shear line. Precipitation on August 10 was generated by typhoon low-pressure inverted trough and cold air. Sufficient water vapor content and strong water vapor transportation were favorable for generation of the heavy precipitation. Suction effect by divergence at high layer and convergence at middle and low layers was favorable for maintenance of the strong ascending motion. Occurrence of the heavy precipitation must have ascending motion condition. But it was not that the stronger the ascending motion,the stronger the rainfall intensity. K index and θse 500-θse 850 were closely related to rainstorm occurrence. Horizontal wind data of the wind profile radar provided fine structure of the atmospheric horizontal motion at vertical direction,could clearly display vertical structure of the wind field in rainstorm process,and directly reflected change characteristics of the wind field in precipitation process. [Conclusion] The research could provide reference for future forecast work.