Analysis of Radar Echo and Lightning Characteristics of A Severe Rainstorm in Jiangxi Province
This study conducts a detailed analysis of a regional severe rainstorm event that occurred on June 9,2019,using conventional observation data,Ganzhou sonde data,radar mosaic and lightning data.The findings indicate that:1)the upper northeast cold vortex was strong,the cold structure was obvious,and the rainstorm area was obviously divergent;There were many short wave troughs in the middle level straight air flow,and there were two troughs and one ridge in the middle and high latitudes.The cold air was continuously transported to the south of the Yangtze River behind the eastern trough;The low-level rainstorm area was located in the convergence area in front of the shear and jet stream,which was the main circulation feature of the heavy rain process.The low-level shear line and low-level southwest jet were the key weather systems influencing this heavy rainstorm.2)The main characteristics of radar echo during the rainstorm process included strong organized convective echo group,squall line echo and unorganized scattered convective echo.Among them,squall line echo exhibited four characteristics,namely"bow"squall line echo,"V"squall line echo,linear squall line echo and squall line echo composed of short band;The higher the top height of the squall line echo,the greater the VIL value,the stronger the convection,and the greater the precipitation intensity.3)The organized convective cell echo group was easily accompanied by lightning and was relatively active;In the"V"squall line echo,the top of the"V"squall line echo was prone to lightning weather,and the lightning density was high;The lightning activity on the"bow"echo squall line was more active and lasted longer;On the linear squall line echo and the squall line echo composed of short band echo,the lightning activity was not obvious,which was the main lightning activity feature in the heavy rain weather process;There was a good correlation between the echo peak height and vertical accumulated liquid water content(VIL)and the occurrence and strength of lightning.
heavy rainlow-level jetsquall line echoecho top heightvertically accumulating liquid water content
万方数据
维普
