Structural Analysis of the Disaster-Causing Supercell Storm in Guangzhou on April 27,2024
LUO Cilin
CHENG Ting
GAO Mingxiang
RONG Lixiang
Abstract：To enhance the understanding of radar characteristics of supercell storm structures,this stud-y analyzed the radar echo features of a severe tornado and hail event that occurred in Guangzhou on April 27,2024,using Doppler weather radar data.The results indicate that this severe convective weather event developed under the synoptic conditions of an approaching upper-level trough and a low-level jet stream.The"trumpet-shaped"thermodynamic profile with dry air aloft and moist air below,combined with strong verti-cal wind shear,facilitated the formation of tornadoes and hail.On that day,the Guangzhou radar detected seven long-lived supercell storms,one of which produced a strong tornado and large hail.Compared to non-tornadic supercells,the tornadic hail-producing supercell exhibited a significantly lower base height,approx-imately double the thickness,a slightly smaller mesocyclone diameter,and greater maximum shear.During tornado formation,the supercell displayed prominent Tornado Debris Signature(TDS)and Tornado Vortex Signature(TVS)structures,with their overlapping positions serving as indicators for tornado touchdown.High Vertically Integrated Liquid(VIL)values,a rapid VIL surge,and a distinct ZDR column suggested intense updrafts within the supercell,promoting rapid hailstone growth through collision and coalescence,thereby sustaining and enlarging hailstones aloft.This study provides critical insights into the structural evo-lution and early warning indicators of tornadic supercells in South China,contributing to improved severe weather forecasting and disaster mitigation.
Keywords：synopticssupercellmesocyclonetornado vortextornado debris signatureGuangzhou
Publication Date：2025-06-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 11-16 )