中文摘要：

利用常规天气图、FY-2D卫星云图、单站地面资料、物理量场等资料,对2012年7月29日下午到夜间武威市的对流性强降雨天气成因进行了系统分析。结果表明：该过程是在一定的大尺度环流背景下高低层天气系统共同作用发生的,地面气象要素的剧烈变化是强降雨天气能量的释放过程;大的湿度条件和水汽在本地辐合,为大到暴雨提供了丰沛的水汽;高层辐散、低层辐合以及强烈的上升气流是大到暴雨发生的动力条件;强烈的不稳定能量和不稳定层结是对流增强、雨强增大的必要条件;对流云团的发展和加强是降雨强度较大的直接原因。

英文摘要：

The formation causes of convection rainstorm weather in Wuwei City from afternoon to night on July 29,2012 were systematically analyzed using the conventional weather charts,FY-2D satellite images and meteorological data observed by a meteorological station,and physical quantity field data.The result showed that the rainstorm occurred under the interaction of multiple factors and a certain large-scale circulation background.Dramatic change of surface meteorological factors was an energy release process of strong convection weather.Local high humidity and water vapor convergence provided an abundant water vapor source for the rainstorm.High-level divergence,low-level convergence and strong ascending motion were the dynamic conditions of the rainstorm.Strong unstable energy and unstable stratification were the necessary conditions of enhancing the convection and increasing the rainstorm intensity.Development and strengthening of convective cloud clusters were the direct causes of the rainstorm intensity.