2012年8月12-13日豫西暴雨过程分析

利用MICAPS常规气象观测资料、NCEP1°×1°6小时分析资料、三门峡多普勒天气雷达资料、自动雨量站资料对2012年8月12-13日豫西地区的暴雨天气过程进行诊断分析，结果表明：①台风“海葵”登陆减弱后的低压环流与中纬度低槽相配合，是造成此次豫西暴雨的主要原因.②前期气温较高，不稳定能量大量积聚，冷锋的影响为冲破不稳定层结提供了外部抬升条件.③减弱后的台风“海葵”带来的我国东部沿海的水汽输送与低层剧烈水汽辐合为此次暴雨提供了所需的水汽.④大范围上升运动区的出现和发展，为强降水的产生提供了动力条件.⑤本次暴雨过程中，高层湿位涡正压项大值区向下伸展，中低层气旋性涡度增大，上升运动加强，有利于降水加强，因此高层湿位涡侵入下伸，对暴雨起到增幅作用.

Diagnostic Analysis of Rainstorm in Western Henan on 12-13 August,2012

Based on the conventional observation data, reanalysis data of NCEP of 1° resolution,Doppler radar products,automatic rainfall stations data,the cause of the rainstorm occurred in the western region of Henan Province on 12-13 August 2012 are analyzed. The results showed asfollows. ①The typhoon“Haikui” landing weakened trough of low pressure circulation and mid-latitude trough compatible is the main reason to cause the western Henan rainstorm.②High temperatures early accumulation of a large number of unstable energy,the impact of the cold front broke through the unstable layer junction external uplift conditions.③Weakened typhoon“Haikui”brings China’s eastern coastal water vapor transport and severes low-level water vapor convergence for the storm provides the desired water vapor. ④A wide range of upward motion of the emergence and development,provides dynamic conditions for strong precipitation. ⑤High-level moist potential vorticity barotropic big value down the stretch,and low-level cyclonic vorticity increases upward motion to strengthen,is conducive to precipitation strengthening high-level moist potential vorticity invasive extension rainstorm to increase the role.