利用铜仁市新一代天气雷达资料及贵阳和怀化探空站资料，对2015年5月14—15日发生在铜仁梵净山东侧的一次特大暴雨天气过程进行诊断分析。结果表明：高空向南加深的槽结合中低层低涡切变线、地面弱冷空气共同作用造成此次特大暴雨；近地层，暖湿气流北上受东北回流冷空气及梵净山地形的横向阻挡作用被迫抬升，使得对流回波维持，对特大暴雨的形成起到重要作用；对流有效位能（CAPE）值的突增是对流暴雨发生的一个重要指标；降水回波伸展高度较高、云层深厚是此次对流暴雨云团的主要特点；垂直液态水含量的突然跃增且高的VIL值长时间维持，可作为短时强降水发生的预报预警参考；较强回波伸展高度较高及强中气旋的发展及维持，为短时暴雨的发生提供了有利的动力条件。%Based on new generation Doppler weather radar data of Tongren and the sounding data of Guiyang and Huaihua,a local tor-rential rain occurring in east side of Fanjing Mountain from 21:00 on 14 to 02:00 on 15 May 2015 was analyzed.The results show that the integrated effect of the trough deepening southward in upper level,low vortex shear line in the low and middle level and the weak cold air of ground layer caused this torrential rain.Near surface layer,the warm and wet air moving north was blocked by the northeast reflux cold air and Fanjing Mountain and forced to uplift,which made the convection echo maintain and caused the torrential rain.At the same time,the sudden increase of CAPE value could be an important index of convective storm.The precipitation echo top exten-ding more higher and the deep cloud were the main features of the convective storm cloud.The vertical liquid water increasing abruptly and high VIL content for a long time to maintain,this can be used as a short-term strong precipitation forecast warning reference .The higher stretching height of stronger echo and the development and maintenance of strong meso-cyclone provided the favorable dynamic condition for the appearance of this local torrential rain.
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