Doppler Radar Data Analysis on A Low-shear Vortex System in Northern Guizhou

By using Zunyi CINRAD/CD Doppler radar data and in combination with other data,a hail strong wind,heavy rainfall in short time occurred on July 10,2008 in the north Guizhou Province was analyzed. The analysis showed that the system is low-shear vortex with a cold air presses to south affected by the transit influence; echo developed in the early monomer arranged along the shear line,and in the development of echo location in generated intense hail weather; before the hail shooting,the strongest echoes values is 60-65 dbz,when the hail shooting the low elevation angle echo strength leap increases to 55-60 dbz,echo height of 11-15 km,VIL values 35 kg/m2; echo distributed in vortex band features,when the vortex center move the original echo,echo dramatic increase,resulting in a profound and lasting convergence of cyclones,hail,strong winds happened on the ground there; towns of northern Renhuai hail and strong short-term precipitation may be related to the left inverted U-terrain; Yongxing and Yuquan towns of Meitan City,Xuekong and Xitou towns of Renhuai City echo are the supercell echo,other regional hail shooting echo is the multi-monomer strong echo.