Application of radar data in a squall line simulation

June 14, 2009, in Anhui province and Jiangsu province, there was a squall line weather process which causes the thunderstorms, hail and high winds and other severe convective weather. Based on the radar echo and NCEP reanalysis data of 0.5°×0.5° with the 6h interval, a squall line event in the large scale and meso-scale weather background were analyzed comprehensively. The radar echo displays “bow” shape, with a clear outflow boundary (gust front) in the front of it. Corresponding to the bow echo in reflectivity factor echo, the velocity echo shows significant mid-level radial convergence (MARC), indicating strong wind in surface afterwards. It is found with analyzing of squall-line convective cells within the overall evolution that the squall line is shaped by the joint type of discontinuity line and line of rearward continuity, and partial disturbance of the strong convective weather provides a trigger mechanism. In addition, the squall line is successfully simulated using WRF model. By analyzing the evolution of squall line system and the precipitation region, it is shown that WRF model possesses the capability of simulating the squall line; contributes to the characteristics and evolution of squall line mechanism analysis.