抚顺“090621”冰雹多普勒雷达回波特征分析

利用常规气象资料和沈阳多普勒雷达资料，从天气背景、物理量和雷达回波演变特征分析了2009年6月21日抚顺东部地区出现冰雹天气过程的成因。结果表明：此次冰雹天气发生在地面低压带、500hPa冷涡底部东南象限中，500hPa冷涡移动触发低层切变线形成。冰雹发生前大气有不稳定能量和水汽输送条件。850hPa低空冷空气的侵入加剧了大气层结不稳定，促进不稳定能量的释放。产生冰雹天气，高低空急流配合为强对流发展提供了动力条件。多普勒雷达资料表明，强对流天气有多个对流单体组成，发展强盛时有弓形、钩状和V形缺口等特征，强回波区为50～60dBz，最大达67dBz。径向速度有辐合区和逆风区。逆风区出现于冰雹前1h，是冰雹出现的强信号。液态水含量为20～40km／m^2，最大垂直液态水含量为50km／m^2。出现冰雹的对流单体回波顶高9．11km。垂直风廓线。中风向、风速出现较大垂直切变。

An Analysis of Doppler Radar Echo Feature on Fushun 090621 Hail

Weather background,physical quantities and development characteristics of radar echoes,routine meteorological data and Shenyang Doppler radar data were used to analyze the causes of the hail synoptic process in the east of Fushun on June 21,2009.The results suggested: the hail weather occurred in the surface low pressure zone and the southeast quadrant of the bottom of the 500 hPa cold eddy,which was formed by 500 hPa cold eddy mobiling and triggering the low-level shear line.Before the hail,there were unst...