2019年5月18—19日江西省暴雨天气过程分析

Analysis of Rainstorm Weather Process in Jiangxi Province from May 18 to 19,2019

利用地面和高空、多普勒雷达资料和NCEP 2.5×2.5再分析资料,对江西省一次典型暖区暴雨过程(2019年5月18—19日)进行分析及成因探讨。结果表明,本次暴雨过程具有历时短、强度大、降水集中和对流性质明显的特点,且以短时强降水为主,并伴有强雷电,局地出现冰雹和雷暴大风;低层暖湿气流和切变线是本次降雨过程的主要影响系统,随着切变的南压,强降雨落区也向南移动,形成了江西省自北向南的暴雨过程;中尺度对流云团发展与暖区暴雨落区存在良好的对应关系。

Using ground and high altitude,Doppler radar data and NCEP 2.5×2.5 reanalysis data,this paper analyzes and discusses the cause of a typical warm area rainstorm process(may 18~19,2019)in Jiangxi Province.The results show that the rainstorm process has the characteristics of short duration,high intensity,concentrated precipitation and obvious convective nature,and is dominated by short-term heavy precipitation,accompanied by strong lightning,hail and thunderstorm gale locally;The low-level warm and humid air flow and shear line are the main influencing systems of the rainfall process.With the southward pressure of shear,the heavy rainfall falling area also moves southward,resulting in the rainstorm process from north to south in our province;There is a good correspondence between the development of mesoscale convective cloud clusters and the rainstorm falling area in the warm region.