Simulation and Diagnostic Analysis of '5.10' Rainstorm Disaster Weather Process in Minxian of Gansu

A rare lightning,short-term heavy precipitation,hail,gustiness wind and other severe convective weathers occur in Minxian,Gansu Province on 10 May 2012.The rainstorm process caused large casualties and property losses.The weather process simulated using WRF mesoscale model and NCEP reanalysis data.Water vapor source is simulated using backward trajectory analysis method(HYSPLIT_4 dispersion model).Meanwhile,the diagnostic analysis of physical quantity in the rainstorm process is carried out.The results show that WRF mesoscale model simulates well for the rainstorm process.During the precipitation process,the convergence of evere upward motion in rainstorm area provides the impetus condition for the formation and development of strong precipitation,and negative spiral degrees with low-rise brief appearance can be used as an indicator for the coming precipitation.Water vapor convergence from the West Asian region and the Bay of Bengal in middle level over the Gannan provides sufficient water vapor.Aggregation and release of the unstable energy,and energy release process faster than accumulation process,lead to the rainstorm generation.