【作者】 李戈； 王珏； 白家惠； 崔树林； 朱丽娜； 孟刚； 李新；

【Author】 LI Ge1 ,Wang Jue2 , Bai Jia-hui1 , Zhu Li-na1 ,Cui Shu-lin1 ,Meng Gang1,Li Xin1(1 Pingdingshan Meteorological Bureau of Henan Province , Pingdingshan 467000, China;2 Nanyang Meteorological Bureau, Nanyang 473000, China)

【机构】 平顶山市气象局； 南阳市气象局；

【摘要】 利用常规观测资料和多普勒雷达探测资料,对2008年7月22-23日河南省的一次暴雨、大暴雨过程的天气形势及多普勒雷达资料做了较详细的分析,结果表明:这次过程的主要影响系统是西南涡;反射率图上,"列车"效应使影响地区的降水不仅强度大,而且持续时间长;速度场上,强降水时段与"牛眼"结构完美存在时段对应较好;风廓线图上,强烈的西南暖湿气流叠加在东北干冷气流之上加大了垂直切变,十分有利于暴雨的发生发展,"ND"区的出现对暴雨过程的开始与结束有很好的指示意义。更多还原

【Abstract】 A southwest-vortex heavy rainfall occurred in Henan province on 22 to 23 July,2008.A more detailed analysis of weather situation and Doppler weather radar data was made based on the routine observation data and Doppler weather radar data.Results are as follows:The southwest-vortex is its mainly influencing systems.On reflectivity picture,train effect made the influenced area not only a larger rainfall but also a longer period.On radial velocity picture,complete cow eye could give good indication for heavy rainfall.On VWP picture, strong southwest warm-moist airflow on northeast dry-cold airflow enlarge enhanced the vertical wind shear,which was favourable for the development of heavy rainfall;the occurrence of"ND"could better indicate the beginning and end of heavy rainfall.更多还原