台风登陆后引发的闽东内陆暴雨分析

Analysis of a Heavy Rainfall Influenced by Landing Typhoon in Eastern Fujian

利用常规资料、新一代天气雷达回波和物理量场资料 ,对 2 0 0 4年 8月 13～ 14日暴雨—大暴雨过程进行了分析。认为 0 4 14号台风登陆后引发的闽东内陆暴雨是在稳定的大尺度环流背景下 ,多种尺度天气系统相互作用的结果 ,物理量场分析表明 :不稳定度K指数对暴雨预报有预示作用 ;地形抬升作用和喇叭口地形对台风暴雨分布影响很大 ;雷达回波资料分析表明 :回波云带的走向与移动方向一致 ,造成强降水区域集中。

By using conventional meteorological data, next-generation radar echo data and physical parameter field data, the causes of the heavy rainfall process occurred on 13, 14 August 2004 in Gutian, Fujian Province, were analyzed. It was found that the heavy rainfall process was resulted from the interaction of multi-scale weather systems under the context of a large-scale highly stable circulation pattern. The analysis results of the physical fields show that the heavy rainfall instability index plays an indicative role in heavy rain forecasting, and the orographic uplift has great influence on the distribution of heavy rainfall. The radar data reveal that the trend of cloud bands on the radar echo image according with the moving direction resulted in the concentration of severe heavy rainfall.