Refined Characterizes of EF3 Tornado Induced by Typhoon"Mujigae"Based on the Numerical Simulation
DONG Xuefeng
WANG Yingsi
HUANG Xianxiang
YAN Xiaoqiang
ZHANG Shaoting
Abstract：An EF3 supercell tornado,occurring in the external rainbelt of Typhoon"Mujigae"struck Foshan,Guangdong Province,China on 4 October 2015,resulting in severe damage.The tornado event was simulated using the nonhydrostatic mesoscale numerical model WRF V3.6.1.This paper analyzes the storm environmental conditions of the intense tornado and the evolutions of both the tornadic supercell storm and Tornado-Like Vortex(TLV)based on the model data.The analysis reveals that thermally unstable conditions near the storm environment facilitate the formation and development of tornado storms,with the Convective Available Potential Energy(CAPE)reaching 1 000-1 500 J·kg-1 near the TLV.The areas of high 0-3 km and 0-1 km vertical wind shear in the storm environment correspond well with TLV system location.During the developmental and maturation periods of the TLV,the 0-3 km vertical wind shear exceeds 15×10-3 s-1 and 20×10-3 s-1,while the 0-1 km vertical wind shear surpasses 25×10-3 s-1 and 30×10-3 s-1,respectively.Simulated radar reflectivity at 100 m,500 m and 1 500 m demonstrates the evolutionary characteristics of the tornadic supercell storm with hook echoes during development,maturation,and dissipation periods.During the maturation period,the forward-flank downdraft(FFD)and rear-flank downdraft(RFD)intensify within the tornado storm,promoting enhanced updraft inside the storms.The occluded structure of the forward-flank gust front(FFGF)and rear-flank gust front(RFGF)enhance the near-surface cyclonic circulation and the TLV.The TLV center positions between the updraft and RFD,proximate to the updraft side.The tornado formation is preceded by significant intensification of the low-level mesocyclone and development of the middle layer mesocyclone.The formation of the tornado corresponds to the presence of strong low-level mesocyclone.
Keywords：TornadoNumerical SimulationSupercellTornado-Like Vortex(TLV)
Publication Date：2025-06-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：15( 373-387 )