Analysis of Supercell Storm Structure and Mesocyclone Parameters

By using the high spatial and temporal resolution Jinan Doppler Weather Radar data and Jinan,Xingtai sounding data,the structure and mesocyclone parameters of 54 supercell storms during 2003~2008 were analyzed.The results showed that the probability of supercell weather would be higher when SI(showalter index)≤-2 ℃,K(K index)≥ 30 ℃ and 0-6 km wind shear20 m/s.The supercell storms can generally be divided into two categories,namely,type of isolation and mosaic type.To the type of isolation,the max reflectivity,cell-based VIL,max reflectivity height,cell top mesocyclone bottom and top were significantly higher than the mosaic type.Isolation-type supercell had significantly higher probability of hail,lower probability of gale than the mosaic category.But the probability of strong winds occur below the mosaic category.The mesocyclone structure differences between isolation-type supercell and mosaic type supercell determined the differences in the weather phenomenon.