宁夏中北部两次强暴雨过程综合对比分析

2002年6月8日和2006年7月14日宁夏中北部地区分别出现了两次创历史记录的区域暴雨过程。本文就两次强暴雨的降水特点、环流形势、主要影响系统、雷达观测及常用物理量进行对比分析。应用天气学分析及诊断分析方法,对这两次暴雨天气过程的主要触发机制:500 hPa冷槽、700hPa高原低涡等,以及对暴雨发生起重要作用的天气系统,如:地面锢囚锋和台风位置、强度等进行对比。利用常规气象资料和T213数值预报产品,对两次暴雨天气过程的未饱和湿空气静力总温度、低空干暖盖、涡度平流、垂直速度等物理因子进行分析,总结了暴雨发生前后的一般变化规律。

Comprehensive Analysis on Two Rainstorm Cases in the Mid- and North-Parts of Ningxia

The rainstorms on June 8,2002and July 14,2006broke the historical record of precipitation in the region.The precipitation features,circulation patterns,main weather systems,radar data and other basic physical fields in two rainstorm were analyzed using the synoptic theory and diagnosis method.The results show that the main trigger mechanisms in two severe rainfall processes are 500 hPa cold trough,700 hPa plateau vortex.The major systemsuch as occlusion front,the position and intensity of typhoon were compared.With conventional data and NWF products,the total temperature,dry and warm lids at low level,vorticity advection and verticalvelocity were analyzed.