摘要
利用常规天气图、乡镇雨量站等资料,采取天气学诊断方法,从大尺度环流背景、降水天气影响系统、物理量场等方面,分析了2013年5月25-26日河南低涡暴雨天气过程.结果表明:此次大暴雨过程主要是由低空低涡东北移引起的。强降水的落区与高、低空急流的配置和中、低层切变线的位置有着较好的对应关系。水汽通量散度负中心和水汽通量等值线密集区是水汽辐合最强的区域,对大暴雨的落区预报有较好的指示意义。
Through the data of conventional weather maps, the township rainfall station and so on, with the weather di?agnosis method, from the aspects of large scale circulation background, precipitation weather influence system, and physical quantity field, the vortex heavy rain process in Henan in May 25-26, 2013 was analyzed. The results show that:This heavy rain is mainly caused by the northeast shift of low vortex. There is a good correspondence between the strong precipitation area and configuration of high and low level jet and the position of the middle and low level shear line. The negative center of water vapor flux divergence and dense region of water vapor flux are the areas with the strongest water vapor convergence, which have good guidance for the position forecast of heavy rain.
出处
《河南科技》
2015年第07X期143-146,共4页
Henan Science and Technology
关键词
大暴雨
低涡
中低层切变线
西南急流
heavy rain
vortex
middle and low level shear line
southwest jet
