摘要
利用常规观测资料、自动站监测资料、多普勒雷达产品对2010年5月5日晚至6日湘中区域性强降水过程进行了分析。结果表明:暴雨发生前不稳定能量有一个加大的过程,K指数和沙氏指数在暴雨发生前有一定的指示意义,东南急流的建立与强降水发生时间几乎同步;雷达产品资料分析表明,强降水发生在风辐合区,地面辐合线和中低层切变线走向基本一致,且位置接近,为强对流的发生提供了动力条件;强回波带内含有超级单体风暴和多单体风暴;本次过程中中尺度地面气象监测站逐时气旋性(反气旋)流场、负变压中心与随后的强降水落区或移向有较好的对应关系,对短时强降水的落区、预警有较好的指示意义。
By using the conventional observation data,automatic weather station observational data and radar echo data the regional severe rain occurred from May 5 to 6,2010 in the Central Hunan is analyzed.The results show that unstable energy increased.K index and Showalter index had certain directive significance before the rainstorm occurred.Both the southeastern jet established and the heavy precipitation occurred almost happened simultaneously.Radar data indicated that heavy rainfall occurred in the wind convergence zone,The ground convergence line moved in the same direction as the shear line of middle and low level,and the their locations were very closed,which provided dynamic conditions for the occurrence of strong convection.Strong echo band contains supercell storm and multicell storm.In this process,meso-scale meteorological stations hourly cyclonic（anticyclonic） flow and negative allobaric center had a better corresponding relationship to both of the rainfall area and move direction of the subsequent regional severe rain,which had good indication to the occurrence and warning of short-time heavy rain.
出处
《暴雨灾害》
2010年第4期363-369,共7页
Torrential Rain and Disasters
基金
国家科技部公益性行业专项(GYHY200906010)
作者简介
彭双姿,女,1974年生,高级工程师,主要从事天气预报.E-mail：pszxl2735@sina.com
