摘要
利用常规气象资料、NCEP/NCAR 6h再分析资料、卫星云图及多普勒雷达资料,对2015年7月承德一次强对流天气进行分析。结果表明:此次强对流过程是500h Pa冷涡、850h Pa暖湿气流、地面辐合线共同作用形成的。低层西南暖湿气流增大,风向风速辐合,水汽通量散度负值中心上移,促进了低层暖湿空气向上输送,为对流云发展提供了充足的水汽。较高K指数、CAPE值及整层上升运动意味着此次过程具备了较好的热力、能量和动力条件。卫星、雷达资料揭示低云顶亮温发展前端高梯度区冰雹等强对流天气发生概率较大;在强风暴发展阶段存在弱回波区、低层风速辐合、风暴顶辐散、垂直累积液态水大值区;当低层偏东风转为西南风并逐渐加强时,雨强达到最强,当中低层逐渐转为西北气流,降水开始减弱。
Based on the routine observational data, NCEP/NCAR 6h 1＊ 1 reanalysis data, satellite images and Doppler radar data, a strong convective weather occurred on the evening of July 27, 2015 in Chengde areas was analyzed. The results showed that： The cold eddy in 500hpa, Warm and humid air in g50hpa and ground convergence line role in the formation of the strong convection process; Low-level southwest warm and humid air increasing, wind direction and speed convergence, the moisture flux divergence negative center shifting, facilitate low-level warm air upward transportation for the development of convective clouds providing adequate moisture. Higher K index, CAPE value and the whole layer of Upward motion means that the process has good heat, energy and power conditions. Satellite, radar data revealed a greater probability of severe convective weather in the TBB high gradient regionO Strong storm development stage presence weak echo area, the lower wind speed convergence, storm top divergence, vertical integrated liquid water large value area; When the low-level easterly winds turned southwest and gradually strengthen, the rain intensity reached the strongest, which is turning into the lower northwest flow, precipitation began to weaken.
作者
高艳春
张晓辉
彭九慧
王宏
杨杰
Gao Yanchun Zhang Xiaohui Peng Jiuhui Wang Hong Yang Jie(Chengde Meteorological Bureau, Hebei Chengde 06700)
出处
《内蒙古气象》
2016年第4期20-24,共5页
Meteorology Journal of Inner Mongolia
