一次雷雨大风天气的多普勒雷达资料分析

摘要

By using conventional observation data and radar data,a thunderstorm and gale weather happened in Anyang on 4th Agu,2010is analyzed.The results show that the shape of '人' formed by multiple echoes is displayed on the reflectivity map of Doppler radar,which can enhance the convection.Short-term strong rainfall and ground gale appear on the top of '人' and its moving path.Thunderstorms are observed from radial velocity diagram that appears the zone of against the wind and large radial convergence.Meanwhile,the heavy rain and gale display within this zone and its moving path.The time and drop zone of short-term strong rainfall,thunderstorms and local winds are corresponding to appearance time and location of the cyclone in radar echo path.During this process,it appears higher radar echo top,strong echo and vertical accumulation liquid water content with higher height in the layer of 0℃.Live weather is mainly of the strong thunderstorm,short-term strong precipitation and local gale without the hail.%利用常规实时观测资料和雷达产品资料,分析了2010-08-04安阳地区出现的一次雷雨大风天气,结果表明：多普勒雷达基本反射率因子图上多条回波带的合并,形成＂人＂字型回波带使对流增强,短时强降水和地面较大的风出现在＂人＂字型回波顶端及其移动路径上;多普勒雷达径向速度图上出现＂逆风区＂和大的径向速度辐合,是产生雷雨大风的直观表现,且强降雨和大风出现在＂逆风区＂和大的径向速度辐合区内及其移动路径上;短时强降水、强雷暴和局地大风出现的时间段和落区与雷达回波移动路径上中气旋出现的时间段和位置有很好的对应关系;此次过程出现了较高的雷达回波顶、强回波和大的垂直累积液态水含量,但0℃层高度过高,实况天气以强雷暴、短时强降水和局地短时大风为主,未出现冰雹天气。