Analysis of a High Precipitation Supercell Based on Dual Polarization Radar Observations in Central Guangdong Province
Weng Jiafeng
Liang Xiaoyuan
Luo Bin
Peng Duan
Abstract：A severe precipitation supercell accompanying extremely heavy rainfall in central Guang-dong Province on 7 June 2020 is analyzed based on observations of dual polarization radar and conven-tional observations in Guangzhou so as to reveal the polarimetric signatures and dynamic characteristics of this severe precipitation supercell.The results show that:(1)During the extremely heavy rainfall process,the southwest low-level jet on the south side of the shear line provided sufficient water vapor and unstable energy,the middle-level multi-wave shortwave trough brought dry and cold air enhancing the stratification instability,and the ground convergence line triggered the occurrence and development of the severe convection.Before the severe rainfall,the ultra-low-level southerly airflow was strengthened propa-gating to the upper layers.With the formation and expansion of the low-level jet,the precipitation inten-sity increased significantly.(2)Precipitation echoes continued to generate and develop over Foshan City and Qingyuan City,and then merged and strengthened in the process of eastward movement,developing into a severe precipitation supercell.In the lower layer of the supercell,the area of decreased correlation coefficient can be used to indicate the positions of the updraft in the lower layer,the bounded weak echo zone and the hook echo,while the differential reflectivity(ZDR)ring and the correlation coefficient(CC)ring before the formation of mesocyclone can indicate the position of the updraft in the middle layer and the development of the vortex into the mesocyclone.When there is little difference in the strong re-flectivity factor values,the larger the KDP,the heavier the precipitation.
Keywords：severe precipitation supercelldual polarization radardifferential reflectivitycorrela-tion coefficient
Publication Date：2024-12-28
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：8( 1-8 )