2015年盛夏梵净山区域特大暴雨的雷达产品特征分析

Analysis of radar product features of heavy rain in Fanjing Mountain in summer of 2015

该文利用C波段新一代多普勒天气雷达探测资料和区域加密自动站降水量资料,对2015年7月14日20时—15日08时贵州松桃县有气象资料以来最强的特大暴雨过程的特征和成因进行了分析研究,结果表明:受贝加尔湖南部高层的深厚低槽和中低层四川盆地东部低涡切变线以及地面冷锋的共同作用,引发了贵州东北部—松桃县出现特大暴雨天气过程。低空西南急流把低纬海洋上的水汽源源不断输送进暴雨区;低层辐合、高层辐散是暴雨产生的动力条件;强回波缓慢移动和垂直发展旺盛是局地暴雨产生的前兆特征;逆风区的出现及持续表明降水会持续、加强,强降水发生在逆风区的边缘地带;VWP图像上,低层暖湿、高层干冷的层结结构表明降水即将发生,降水发展期间VWP上暖平流特征明显,低层切变层加深增厚,中低层"ND"区域上下蔓延预示着降水趋于停止。

The new generation of Doppler weather radar detection data and regional automatic station precipitation data were used to carry out analysis and research on the characteristics and causes of the strongest heavy rain occurred ever in the existence of the meteorological data,which happened in Songtao Guizhou On July 2015 14 20o＇clock to 15 days 08 o＇clock. And Results show： the interaction of Baikal senior Ministry of deep low trough and low- level Sichuan basin east of vortex and shear line and surface cold front,results in heavy rainfall weather process occurred in northeastern Guizhou,Songtao. Low level southwest jet stream drove the low latitude water vapor into the storm area; The low level convergence and upper level divergence is the dynamic conditions of the rainstorm; Radar echo moving speed is slow and strong vertical development is precursory characteristics of the heavy rain,and upwind continue show that the precipitation will continue to strengthen,The edge of the heavy rain occurred against the wind; VWP images,low- level warm wet,top of the dry and cold stratification structure show that precipitation is about to occur,the precipitation during the development of warm advection on VWP characteristics significantly,low- rise shear layer deepen thickening,up and down in the lower ＂ ND＂ regional spread indicates precipitation tends to stop.