2015年7月27—28日张家口地区一次暴雨过程分析

应用MICAPS常规资料和区域站降水资料,对2015年7月27-28日发生在张家口地区的一次暴雨过程进行综合分析。结果表明,此次强降水过程是由于冷空气东移南下与副高外围的暖湿气流交汇产生的,冷涡系统,短波槽、低层切变线以及副高外围暖湿气流,地面存在倒槽结构,这些系统为暴雨产生提供大的环流背景。各物理量分析表明,张家口地区动力条件、热力条件、水汽条件配合较好,均有利于强降水的发生。

Analysis of a Rainstorm Process in Zhangjiakou Area from July 27 to 28,2015

Based on MICAPS conventional meteorological data and national station precipitation data,a rainstorm process which occurred on July 27-28,2015 in Zhangjiakou was analyzed.The results showed that the heavy precipitation process was caused by the convergence of cold air moving eastward and southward with the warm and moist air around the subtropical high pressure.There were inverted grooves on the ground in the cold vortex system,shortwave trough,low-layer shear line and the warm and wet air around the subtropical high pressure. These systems provided a large circulation background for the rainstorm. The analysis of various physical quantities showed that the dynamic,thermal and water vapor conditions in Zhangjiakou area cooperated well,which were all conducive to the occurrence of heavy precipitation.