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.

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。

youdao

Second indirect effect is existed when tropical cyclone moves toward the north. The heavy rain-fall of inversion trough has not only arisen in downstream of easter…

热带气旋北上时，存在第二类间接作用，不仅在东风急流下游能出现倒槽暴雨，还有利于热带气旋下游的副热带高压另一侧产生特大降水。

youdao