2005年7月30-31日新乡市连续两夜暴雨过程分析

Analysis of the Continuous Night Rainstorm Process over Xinxiang on July 30-31, 2005

对2005年7月30-31日新乡市连续两夜出现的暴雨过程诊断分析结果表明:两夜暴雨均是在有利的大尺度环境条件下,激发中尺度系统发生发展而引起。连续两夜出现的暴雨,均处在强上升气流区域的北部边缘,而不是强上升气流中。在sθe陡立密集区有利于湿斜压不稳定能量的聚集和中尺度天气系统的发生发展。对流场进行尺度分离,有利于发现形成暴雨的中尺度系统。

The process of the continuous night rainstorm on July 30--31,2005 over Xinxiang was an- alyzed. The results indicated the rainstorm was caused by exciting occurrence and development of mesoscale system under the advantageous general circulation environmental condition. The continuous night rainstorm occurred in the north edge of the strong updraft , not in the center. In the steep cluster region of Ose is propitious for the gather of wet baroclinic instable energy and the occurrence ＆ development of mesoscale system. The scale separation of flow field is helpful to find the mesoscale system of form the rainstorm.