结果表明，本次大暴雨是0418号热带气旋在福建登陆后，其北伸倒槽与西风带弱冷空气结合所产生的热带气旋远距离暴雨。
The result shows that the heavy storm is caused by the interaction between 0418 tropical cyclone trough landed in Fujian Province and a weak cool front in the westerlies.
商丘市的大雾多形成在大陆高压型、冷锋前暖区型、均压场型、(低压)倒槽型天气形势中。
The heavy fogs of Shangqiu are formed by the weather situations: continental anticyclone, warm zone in front of cold front, uniform pressure field, and low pressure with an inverted trough.
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。
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.
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