2020年9月12—13日漳州市一次暴雨天气过程分析

Analysis of a Heavy Rain Weather Process in Zhangzhou from September 12 to 13,2020

利用自动气象站资料、NCEP再分析资料、雷达资料等相关气象资料,对2020年9月12—13日漳州市一次暴雨天气过程进行分析。结果表明:此次暴雨天气发生期间,江南大多数区域属于高压环流,福建处于高压环流东边偏北至东北气流辐散区域,比较适宜于低层对流的发展;地面冷空气和低层切变共同促进了暴雨天气的发生发展。漳州市上空比湿值为14.0 g/kg,漳州市上空区域的水汽十分丰富,在该地区上空存在显著的水汽辐合,非常适宜于暴雨天气的发生发展。漳州市K指数达到40℃,处于假相当位温大值区以及上升运动较大值区域,为此次暴雨天气的发生带来了有利的热力以及动力条件。此次暴雨天气的变化趋势对应着降水回波演变趋势;逆风区的出现对暴雨天气的预报具有重要的指示意义。

This article analyzed the weather process of a torrential rain in Zhangzhou from September 12 to 13,2020using relevant weather data such as automatic weather station data,NCEP reanalysis data,and radar data.The results showed that during this heavy rain,most areas in the south of the Yangtze River belonged to the high-pressure circulation,and Fujian was in a divergent area from the northeast to the northeast of the high-pressure circulation,which was more suitable for the development of low-level convection;at the same time,the ground cold air and low-level cuts Changes had jointly promoted the occurrence and development of rainstorms.The specific humidity value over Zhangzhou was 14.0 g/kg.The area above Zhangzhou was rich in water vapor,and there was significant water vapor convergence over the area,which was very suitable for the occurrence and development of heavy rain.Zhangzhou’s K index reached 40℃,and it was in a region with a large value of false equivalent potential temperature and a region with a large value of rising movement,which brought favorable thermal and dynamic conditions for the occurrence of this torrential rain.The change trend of this torrential rain weather corresponded to the evolution trend of the precipitation echo;the appearance of the upwind zone had important indicative significance for the forecast of torrential rain weather.