2020年5月6—7日福建中北部暴雨过程分析

Analysis of Rainstorm Process in Central and Northern Fujian on May 6-7,2020

利用常规气象资料、自动站资料、EC再分析资料和雷达资料,从环流背景、物理量场等方面分析2020年5月6日福建中北部暴雨过程。结果表明:500 hPa中低纬多短波槽活动,福建上空低层切变弱辐合、中高层强辐散,动力抬升作用明显;低层西南急流提供丰富水汽,存在风速辐合,暴雨区水汽层结深厚;地面倒槽北抬过程;高K值、CAPE值显示层结不稳定;高低层系统配合,结合地面倒槽影响,是此次暴雨产生的主要原因。

Based on conventional meteorological data,automatic weather station data,EC reanalysis data and radar data,the rainstorm process in central and Northern Fujian on May 6,2020 was analyzed from circulation background and physical quantity field.The results show that:500 HPA mid low latitude multi short wave trough activity,low-level shear weak convergence,high-level strong divergence over Fujian,dynamic uplift effect is obvious;low-level southwest jet provides rich water vapor,there is wind speed convergence,heavy water vapor stratification in the rainstorm area;surface inverted trough northward lifting process;high K value,CAPE value shows stratification instability;high-level system cooperation,combined with the influence of surface inverted trough,is the cause of the rainstorm The main reason for this.