中文摘要：

通过对2002～2005年s波段多普勒天气雷达上旁瓣回波的分析，描述了其在基本反射率因子、径向速度、速度谱宽PPI图及反射率因子和径向速度垂直剖面图上的形态特征。在7次强对流事件的19个雹暴云中发现有6次强对流事件10个雹暴云共产生旁瓣回波110次（基于反射率因子仰角产品的统计）。统计结果表明：形成旁瓣回波最小反射率因子强度为60dBz，97．3％的旁瓣回波出现在反射率因子强度≥63dBz时，旁瓣回波出现在50～100km距离段内的机率最大；旁瓣回波出现的最大高度为11km，最低高度是1km，97．3％的旁瓣回波出现在1—9km高度之间，69．1％的旁瓣回波出现在3～6km高度之间，以4～5km高度出现次数最多，然后向上、向下减少。据灾情调查报告分析，强降雹发生在旁瓣回波首次出现后的0～42min内，表明旁瓣回波对强降雹具有一定的临近预警作用。

英文摘要：

In this paper, by analyzing the hailstorm side-lobe echo from Changde S-band Doppler weather radar from 2002 to 2005, morphological characteristics of side-lobe echoes are depicted with regard to reflectivity, radial velocity, velocity spectral width PPI map and vertical cross-section of reflectivity and radial velocity. Among 19 hailstorm clouds during seven severe convective events, the side-lobe echoes are observed in 10 hailstorms during six of them. The results show the followings. （1） The echo intensity of side-lobe is proportional to the volume of high reflectivity. （2） For the side-lobe echoes observed, the minimum reflectivity is 60 dBZ and 97.3% of them appear with reflectivity greater than 63 dBz. （3） Side-lobe echoes usually occur within the radar range of 50 ～ 100 km. （4） 96.1% of the side-lobe echoes occur within the height between 3 and 6 kin. （5） Severe hails occur within 0 ～ 42 minutes after the first side-lobe echo appears, indicating that recognition of side-lobe echoes can help the warning of severe hail.