Mesocyclone Features of Supercell Storms from CINRAD/SA

The supercell storm often accompanies with the hails,thunderstorms and other severe convective weather,and its most essential feature is a mesocyclone,which is a lasting and deep vortex on several kilometers scale.Based on the 32 supercell storm data observed by Longyan CINRAD/SA radar from 2003 to 2009,the mesocyclone products are statistically analyzed.Results show that more than 90% of the supercell storm's mesocyclone is well related with severe convective weather such as hail,thunderstorm,short-time strong rainfall and so on.The paper analyses the spatial and temporal distributions,structure features,rotational velocity,heights of base and top,thickness of elongation and shear value of the supercell storm's mesocyclone.Based on the eight weather processes with hails or thunderstorms,it shows that the hail,thunderstorms and other severe convective weather will occur when the mesocyclone constantly strengthens,the thickness of mesocyclone increases and the center of strongest shear suddenly drops.