对首都机场地区一次雷雨天气过程的初步分析

Preliminary Analysis of a Thunderstorm Weather Process in the Capital Airport Area

利用NCEP再分析资料以及多普勒雷达产品图片资料,对2009年7月22日发生在首都机场地区的雷雨过程进行了诊断分析,揭示了此次雷雨过程的产生机制。结果表明:低层暖舌的存在为此次雷雨过程创造了良好的热力不稳定层结;低层850 hPa浅槽的过境为此次过程的触发因子;雷达产品图上外流边界、中气旋的识别有助于判断是否会出现大风或冰雹天气。另外,综合分析了各不稳定指数对强对流天气过程的预报有着很好的指示意义。

This article uses NCEP reanalysis data and Doppler radar product picture data to diagnose and analyze the thunderstorm process that occurred in the capital airport area on July 22, 2009, and reveal the generation mechanism of the thunderstorm process. The results show that the existence of the low-level warm tongue created a good thermally unstable stratification for the thunderstorm. The low-level 850 hPa shallow trough crossing is the triggering factor for this process. The identification of outflow boundaries and medium cyclones on the radar product map can help us determine whether there will be strong winds or hail weather.In addition, the comprehensive analysis of various instability indexes has a very good indication significance for the forecast of severe convective weather processes.