单 位：
南京大学大气科学学院;江苏省南通市气象局
关键词：
大冰雹;不稳定层结;悬垂特征;有界弱回波区;风垂直切变
摘 要：
使用地面高空观测资料、NCEP6h再分析数据和CINRAD/SA雷达观测资料,对2009年6月14日发生在江苏省南通地区的一次强对流天气的环流形势、大气稳定度、雷达回波特征进行了分析。结果表明,此次冰雹发生在东北低涡建立起的沿海槽后大尺度背景下,500hPa的冷空气覆盖在中低层暖空气上,为冰雹、雷雨大风等强对流天气的出现提供了有利条件。从雷达回波上分析得知,引起这次强对流天气的风暴具有超级单体风暴的特征,西北边和东南边出现2条明显的出流边界和悬垂结构的特征;对流层中低层较强的垂直切变和合适的冻结层高度也成为了有利于降雹的条件。
译 名：
Analysis on the Formation Reason of A Rare Big Hailstone Weather in Nantong City
作 者：
WU Cai-xia et al(College of Atmospheric Science in Nanjing University,Nanjing,Jiangsu 210093)
关键词：
Big hailstone;Unstable stratification;Overhanging characteristic;Bounded weak echo region;Vertical shear of wind
摘 要：
By using the ground and high-altitude observation data,NCEP 6 h reanalysis data and CINRAD/SA radar observation data,the circulation situation,the atmospheric stability and the radar echo characteristics of a strong convection weather which occurred in Nantong area on June 14,2009 were analyzed.The results showed that this hailstone happened in the large scale background of coastal trough rear which was established by the northeast low vortex.The warm air in the middle-low layer was covered with the cold air in 500 hPa,which provided the favorable condition for the occurrence of strong convection weather which included the hailstone,the thunderstorm,the gale and so on.Seen from the analysis on the radar echo,the storm which caused this convective weather had the characteristics of super monomer storm.In the northwest and the southeast,there were two obvious characteristics of outlet boundary and overhanging structure.The strong vertical shear and the suitable frozen layer height in the middle-low layer of troposphere were also the favorable conditions of hail shooting.
