忻州市东部地区一次暴雨过程分析

Analysis on a Heavy Rainfall Process in East Area Xinzhou

利用NCEP的1°×1°再分析资料、常规天气资料以及加密自动雨量站资料,从高低空影响系统和物理量场着手,对造成忻州市2012年7月30—31日东部地区暴雨天气过程的物理机制进行分析。结果表明:500 hPa西风槽前部西南暖湿气流相与东北冷涡后部的下滑的冷空气互作用,700 hPa低涡切变线、低空急流、中尺度的对流云团低空辐合是造成此次大暴雨的主要影响系统;而低层的潜在不稳定能量的储存和输送是大暴雨发生不可缺少的条件。

Using NCEP 1°×1° reanalysis data, conventional weather data and encryption of automatic rainfall stations, the au- thors analyzed physical mechanism of s rainstorm process in eastern region, Xinzhou City 30--31 July 2012 based on the high and low altitude affect the system and the physical field. The results showed that the main impact of heavy storm system were the front of the 500 hPa westerly through southwest of warm air phase the cold northeast cold vortex rear down- turn interaction 700 hPa vortex shear line, low level jet meso-scale convective clouds at low altitude convergence caused this; storage and transport of low-level potential instability energy heavy rain occurred indispensable condition.