综合利用多源资料及NCEP/NCAR再分析资料,对2015年11月10-12日湘江流域冬季罕见的暴雨过程进行分析.结果表明,此次强降水过程是1961年有气象记录以来湘江流域最大洪水过程.孟加拉湾低槽东移、西太平洋副高强度偏强、脊线稳定维持在20°N附近、近地面东部冷高压与向东移动的暖低压在湘江流域对峙为此次强降水的发生提供了有利的环流背景.强降水发生在大气层结稳定的状态,旺盛的西南暖湿气流与冷空气在湘江流域交汇,配合持续稳定的辐合上升运动等条件,造成了湘江流域罕见的冬季暴雨天气过程.%Based on the national centers for environmental prediction global forecast system reanalysis data,weather station data and Doppler radar data,we have analyzed a heavy rain event that occurred in Hun'an in 10-12 November 2015.The results show that it was the largest flood in Xiangjiang basin since 1961.After the ridge line was strengthened in Ural,the low move to the east in the Bay of Bengal,the western Pacific subtropical high strength is stronger,the ridge line is maintained at 20°N,the cold high in the near surface area in East China and the warm low moving to northeast confrontation in South Hu'Nan,the heavy rain occurred in the advantageous circulation background,it occurred in addition to steady atmospheric stratification.The southwest moist air from the Bay of Bengal meets the cold air from the north,dynamic condition was provided by sustainable convergence and updraft,due to the heavy rain event.
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