一次冷涡降雹的雷达回波特征分析

Analysis of Radar Echo Characteristics of A Hailstorm Event Caused by Cold Vortex

利用烟台多普勒天气雷达资料,重点从雷达反射率因子形态演变、径向速度场结构特征、VWP风廓线和风暴追踪信息等方面入手,对2010年5月30日早晨发生在烟台地区的冰雹天气进行分析,综合分析此次冷涡降雹的中尺度特征。结果表明,造成此次冷涡降雹的系统具有明显的超级单体风暴特征,其初始回波高度在6 km左右,向上和向下发展迅速,垂直累积液态水含量(VIL)值在降雹前有明显的变化,VWP风廓线产品上降雹前在低层有冷层的存在,对冰雹的产生有一定的指示意义。

Using Doppler radar data of Yantai,focusing on evolution of reflectivity factor,velocity field,wind structure characteristics,VWP,and storm tracking information,a hailstorm event occurred on May 30,2010 in Yantai was analyzed,as well as the mesoscale characteristics of this cold vortex induced hailstorm.The results showed that the effecting system of this hailstorm had obvious aspects of supercell storm.Its initial echo height was around 6 km,and it developed vertically.The VIL value changed obviously before hailstorm occurrence.According to VWP,there existed a cold layer on lower level before hailstorm,which is indicative for predicting hailstorm.