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中文摘要：
采用美国ERSL实验室LAPS系统融合NCEP 1°×1°逐日再分析资料、业务观测和雷达资料,分析了2007年6月18日发生在湖北中部的一个伴有前导层状降水对流线发生、发展及消亡的结构特征。结果表明,该系统在雷达回波上主要分为两部分：后方回波强而窄的对流带和前方回波相对弱的宽层状降水区,在对流带和层状降水区之间有一条回波更弱的转换带。流场上RFLS系统主要由4种气流组成：在层状降水区前方中低层有一个由上而下转为从前向后的入流、对流层低层从后向前的入流、朝前倾斜的上升气流、中上层由后向前的气流。该系统在组织阶段开始产生前导层状降水区,到成熟阶段垂直气流发展旺盛,前方的层状降水区变宽。中低层垂直对流线的垂直风切变随时间增大和地面冷丘随时间减弱或者不变,是18日RFLS系统上升气流向前倾斜的主要原因。
英文摘要：
A rear-fed leading stratiform mesoscale convective system（RFLS MCS）was observed in middle part of Hubei Province during Meiyu period of 2007.The stream structure feature of the RFLS on June 18,2007 are analyzed using LAPS of ESRL（Earth System Research Laboratory）,USA,and NCEP 1°×1° daily reanalysis data,operational observation and radar data.The horizontal reflectivity structure observed by radar is as follows： Astrong and narrow echo band is in the behind of convective line,and a sub-strong and broad echo area is frontof this convective line,there is a weak echo gouge between them.The convective cells sometime elongated and canted along the convective line.The RFLS systemon 18 June mainly consists of fourflow branches： Rear-to-front inflowat lower level,front-to-rear descending inflow and ascending flow which produce stratiform cloud anvil by tilting the rear-to-front flow in the middle and upper troposphere layer,rear-to-front flowat middle level.The RFLS system on 18 June has an overturning updraft during its early stages,and produce leading stratiform precipitation.In mature stages the vertical flow develops strongly,and the frontal stratiform echoes continue to strengthen.The line-perpendicular vertical wind shear in middle and lower troposphere layers increasing with time and the surface cold pool weakening or keeping changeless with time are the main causes for which this RFLS system updraft flow tilts frontward.
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