Study shows that the process is caused by cold vortex in the east of Mongolia and subtropical high, and mesoscale convective cloud cluster is the direct reason of the local severe heavy rainfall.
发现本次过程是由蒙古东部的低涡与副热带高压共同作用发生的，而局地大暴雨的直接原因是中尺度对流云团所造成的。
The heavy rainfall is dominated by a mesoscale warm shear line, having a closed relationship with a mesoscale system composed by mesoscale shear line, thunderstorm high and mesoscale vortex;
这次强降水与中尺度切变线、雷暴高压和中尺度气旋等中尺度系统关系密切，为一次中尺度暖式切变线暴雨过程；
The following conclusions can be drawn. 1. The main influence systems of causing this heavy rainfall are southwest vortex, shear line and southwest low-level jet.
低涡切变线、西南风低空急流、东风气流和地面倒槽是本次暴雨的主要影响系统，该地区维持高能，饱和，位势不稳定的小环境，有利于特大暴雨的产生和维持。
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