短时大暴雨的多普勒雷达探测及暴雨预警信号发布

The Mechanism of the Very-Short Torrential Rains in Guangzhou and Experience from Issuing Warning Signal of Heavy Rains Based on CINRAD-SA

本文通过对环流背景和广州C INRAD-SA多普勒天气雷达资料的详细分析,探讨了发生在广州市的一次短时大暴雨的成因。结果表明:广州市夏季短时大暴雨在低空急流、低层辐合以及高空辐散和抽吸作用的有利环流背景下,多个单体接连穿越同一地区所造成,单体排列方向与单体移动方向一致。弱中气旋特征、逆风区和能量锋对对流的维持和加强起到了十分重要的作用。另外本文还对暴雨预警信号的发布技巧进行了探讨。

The circulation background and data from the Doppler weather radar （CINRAD-SA） in Guangzhou are analyzed and the causes of very-short torrential rains in Guangzhou are analyzed. Results show that the severe rainstorm occurred in Guangzhou in summer was caused by favorable synoptic conditions with multi-cells passing by the same site, being consistent with its moving direction. Weak mesocyclone, the ＂inverse-wind region＂ and the energy front plays an important part in convection development and maintenance. In the paper, the skills for issuing rainstorm warning signal are discussed also.