中文摘要：

沿着在长江的更低的活动范围的 Meiyu 前面的重降雨事件在 2009 年 6 月 23 日与一个 mesoscale 骚乱旋涡被连接，这被发现，它从行星的边界层(PBL ) 发源并且以后向上发展了并且被使用过滤方法的 Shuman-Shapiro 发现。在在这个过程的 PBL (PMDV ) 的 mesoscale 骚乱旋涡在 Doppler 雷达回响对应于很好短时间的暴风雨。从先进天气研究和预报模型(ARW ) 的高分辨率的模拟结果的分析证明沿着在 PMDV 的产生以前的 Meiyu 前面的南部的温暖的节有几表面骚乱。PMDV 与 mesoscale 交往了对流系统(MCS ) 并且加强了本地对流降水。在 PBL 的北方和西南流动在 PMDV 形成的时候收敛了。同时，到旋涡的南方方面的 PBL 的顶上的一口西南的喷气增强了上升运动和集中。因此， shear 线的强壮的冷空气流动北方什么时候 shear 线向南遇到了西南流动，被结束 PMDV 被产生。在 PBL，西南风的增强，和北方风的向南方的侵略的集中线为 PMDV 的发展是批评的。当它在底层便于集中，潜伏的热的版本为 PMDV 的形成被发现关键。

英文摘要：

It was found that the heavy rainfall event along the Meiyu front in the lower reaches of the Yangtze River on 23 June 2009 was connected with a mesoscale disturbance vortex, which originated from the planetary boundary layer （PBL） and developed upward later and was discovered by using the Shuman-Shapiro filtering method. The mesoscale disturbance vortex in the PBL （PMDV） in this process corresponded well to the short-time rainstorm in the Doppler radar echo. Analysis of the high-resolution simulation results from the Advanced Weather Research and Forecasting Model （ARW） showed that there were several surface disturbances along the southern warm section of the Meiyu front prior to the generation of the PMDV. The PMDV interacted with the mesoscale convective system （MCS） and intensified the local convective precipitation. The north and southwest flows in the PBL converged at the time of the PMDV formation. Meanwhile, a southwesterly jet on the top of the PBL to the south side of the vortex reinforced the ascending motion and convergence. Hence, it is concluded that the PMDV was generated when the strong cold air flows north of the shear line encountered the southwest flow south of the shear line. The convergence line in the PBL, the intensification of the southwest wind, and the southward aggression of the north wind were critical for the development of the PMDV. The release of latent heat was found crucial for the formation of the PMDV as it facilitated the convergence at low levels.