通辽市一次久旱转雨天气过程诊断分析

应用常规天气资料、卫星云图及多普勒雷达产品资料，针对2009年4月18日夜间至21日白天通辽地区出现的一次久旱转雨天气过程，通过动力诊断分析和物理量诊断方法阐述了此次过程的环流成因，利用多普勒雷达反射率因子、径向速度、风廓线及回波高度产品，揭示了这次过程天气系统的回波特征。结果表明：这次过程分别是由低层暖湿切变及短波槽不断分裂南下加强后，与地面倒槽配合形成的低涡影响造成的。

The Diagnostic Analysis on Weather Process of Drouth Turning to Rain in Tongliao City

Using the conventional weather data, satellite cloud picture and Doppler radar product data, aiming at a weather process of drought turning to rain at Tongliao area from the night of April 18, 2009 to the day of April 21, 2009, the cause of eircumfluence in this weather process were expounded through dynamic diagnosis analysis and diagnosis method of physical quantity, the echo characteristics of weather system were revealed by reflectivity factor of Doppler radar, radial velocity, wind profile, echo depth products. The results shows： The vortex influence come from the formation of low level warm and wet shear, short wave trough continuously divide, south and strengthen, and together with ground inverse trough formed this weather progress.