Analysis of the 19 September 2023 EF3 Tornado in Funing,Jiangsu,and Multi-Band Radar Monitoring and Early Warning TechniquesⅠ:Weather Analysis and Multi-Band Radar Observation
LIU Jun
ZHOU Honggen
XIA Yuchen
XU Fen
ZHANG Xinghai
SHI Zhao
WANG Xin
Abstract：In order to deepen the objective understanding of the formation mechanisms of tornadoes in Jiangsu and improve the accuracy of tornado monitoring and early warning,this paper investigates the rare EF3-level tornado case that occurred on 19 September 2023 in Funing,Jiangsu,an unprecedented event for September in the history of Jiangsu.The analysis focuses on the reality and disaster situation,weather background and environmental conditions,and multi-band radar collaborative observations.The results are as follows.(1)The"9.19"Funing EF3-Level tornado was a strong tornadic event that occurred under the background of Meiyu weather.The air flow branching in the 200 hPa weather pattern and the wedge-shaped cloud in the 13.3 μm infrared satellite imagery were important indicators of deep convective forcing and advanced prediction of"9.19"Funing tornado.(2)Sudden changes of thermal and dynamic conditions signaled an extremely unstable atmosphere with strong vertical ascent,serving as important potential indicators for the triggering of a strong tornado.At 20:00 BJT on September 19 at the Sheyang sounding station,the Convective Available Potential Energy(CAPE)increased to 2 288.7 J·kg-1,Convective Inhibition(CIN)decreased to 0.2 J·kg-1,the Lifting Condensation Level(LCL)plummeted to 1 005.0 hPa(69 m),and K index increased to 40.2℃.Vertical wind shear rose to 10.9 m·s-1(0-1 km),19.2 m·s-1(0-3 km),and 21.9 m·s-1(0-6 km).(3)The multi-band weather radar network in northern Jiangsu can provide ultra-low altitude data,with the lowest detection height ranging from 100 m to 350 m,which greatly meets the internal needs of tornado monitoring and early warning.The multi-band weather radar in northern Jiangsu had a good adaptive scanning capabilities on the"9.19"Funing tornado.Without manual intervention,Baoying XD radar can carry out reasonable Range Height Indicator(RHI)adaptive scanning,completely capturing the evolution and vertical flow field of tornadic supercell.The Scans clearly revealed key structural featares:a low-to-mid-level reflectivity factor core(RC)and dome structure;middle-to-high-level overhanging echoes;a"V"-shaped gap at 3-5 km height;and a northeast-to-southwest oriented weak echo band between overhanging echoes of the dome and the middle-to-high-level overhanging echoes.The flow field was characterized by the vortex tube circulation in the forward-flank inflow,high-altitude subsidence flow,and the divided rear-flank inflow jet.These results provide a valuable reference for the multi-band weather radar monitoring and warning of tornadoes using multi-band weather radar in Jiangsu and contribute to the objective understanding of tornadic physical processes.
Keywords："9.19"Funing tornadoEF3-level intensityweather analysismulti-band radarmonitoring and early warning
Publication Date：2025-12-31
Online Publishing Date：2026-01-12(First online date of this platform, not the publication date of the document)
Pages：12( 808-819 )