2013年7月8-11日阿坝州雷雨天气过程分析

雷雨天气是阿坝州夏季常见的气象灾害之一，危害较重。2013年7月8～11日阿坝州出现了一次强雷雨天气过程，其中500hPa副热带高压和伊朗高压之间存在的低槽及700hPa东北一西南走向的暖式切变线、低空西南急流是该次雷雨天气过程的主要影响系统；对流层的低层持续存在稳定的西南低空急流，不断携带南海和孟加拉湾高温高湿水汽在短急流带汇聚并向西北方移动，为暴雨区提供了有利的水汽条件；雷雨天气过程中的沙氏指数研、K指数、对流有效位能CAPE和对流稳定指数庀均有着较好的反映。

Thunderstorm Weather Analysis of Aba Prefecture between July 8 and July 11, 2013

Thunderstorm weather is one of the common meteorological disaster in Aba Prefecture, and always causes serious damages. During July 8 and July 11, 2013, the local area witnessed a strong thundershower, the trough of low pressure between 500 hPa subtropical anticyclone and Iran high pressure, and the 700 hPa northeast-southwest warm shear line, low-altitude southwest jet stream were major influence systems of this thunderstorm process. Stable low-altitude southwest jet stream in troposphere brought warm moisture from the south China sea and the Bay of Bengal to the short jet stream zone and further to northeast, and offered favorable aqueous vapor for the rainstorm area; showalter index （S/）, K index, convective avail- able potential energy （CAPE） and Convective stability index had good pertormance in the thunderstorm.