The heavy rain is presented under the condition of the strong positive vorticity, convergence, vapor flux convergence in middle and lower troposphere and stronger divergence at upper troposphere.

大暴雨发生在对流层中低层为气旋性涡旋、流场辐合加强、水汽通量增加、水汽通量辐合加强，并伴有高层较强辐散的情况下。

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The effect of atmospheric entropy divergence, especially in mid-and upper-levels, on theoccurrence and maintenance of heavy rain is as important as latent heating, even more important.

大气熵辐散，特别是中、高层的熵辐散，对暴雨发生和持续的作用，不仅和潜热加热同样重要，甚至更有决定性意义。

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The open air space with convergence at middle and low layers and divergence at high layer was beneficial to maintaining typhoon force as well as heavy precipitation.

结果表明，强大深厚的台风低压系统是降雨的前提条件，中低层辐合、高层辐散的散度场有利于台风势力的维持，对强降水持续起到重要作用；

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