【摘要】 2007年8月7日太原市小店区出现了暴雨,本文利用常规气象观测资料和多普勒雷达资料进行综合分析。结果表明,暴雨出现前期,200 hPa 高空急流的形状和结构发生突变,出口区等高线变成强烈的辐散状,使得前期所积累的水汽和能量急剧释放,太原正好处于急流出口区等高线的辐散区。强烈的高空辐散的大尺度环境,中低层浅槽在发展中东移并形成前倾槽,是暴雨的主要影响系统;河西走廊有冷空气东移为暴雨的产生提供冷暖交互的动力条件,为本地暴雨提供基础;雷达回波图上混合降水回波中有强度较大的对流性回波影响本地。更多还原

【Abstract】 In this paper,the rainstorm weather process occurred on Aug 7 2007 in Xiaodian district of Taiyuan city is synthetically analyzed.The results indicate:1)before rainstorm occurring,the figure and structure of high jet stream change abruptly on 200 hPa,strong divergence leads water vapor and instability energy releasing suddenly.2)Middle -level forward trough is the main Influence system which is caused by development of small eastward -moving trough.3)The eastward motion of cold air from Hexi Corridor provides dynamic condition for rainstorm.4)The above factors cause strong convective radar echoes occuring and affecting Xiaodian district which located under the exit of high jet stream.更多还原