2008年盛夏阿克苏一次强对流天气成因及雷达回波分析

2008年7月24日阿克苏地区出现了暴雨、冰雹强对流天气。利用常规高空、地面观测资料和新一代天气雷达资料系统地分析了此次天气中环流背景、物理量场、雷达回波的演变特征。分析得出，此次强对流天气在上层干冷、下层暖湿的不稳定层结、充沛的水汽条件和较强的抬升运动的配合下，导致不稳定能量突增，直接诱发了强对流天气的发生、发展。雷达回波上的“v”形槽口、有界弱回波的出现、较强的垂直风切变以及气流辐合现象，均为强对流天气回波的典型特征。

Analysis of CausesandRadarEchoes of One Strong Convective Weatherin the Midsummer of 2008 in Akesu

Heavy rainfall and hail convective weather happened in Akesu region of Xinjiang on June 24th 2008. By using conventional meteorological data and next-generation weather radar echo data, we analyzed the evolving characteristics of circumfluence background, physical parameter field and radar echoes in this weather. The results showed that combined with the instability stratification with dry-cold upper layer and warm-humid lower layer, abundant water vapor and stronger uplift movement led to the instability energy to increase suddenly, and induced directly the occurrence and development of strong convective weather. These appearances including V-style rabbet, advent of bounded weak echo region, stronger wind vertical shear and phenomenon of airflow convergence in radar precipitation echoes were all typical characteristics of strong convective weather echoes.