Diagnostic Analysis of 2006-06-13 Torrential Rain in Wangmo,Guizhou

Based on the routine observational data as well as automatic weather stations data,FY-2C satellite cloud pictures,the NCEP/NCAR reanalysis data and Doppler radar data in Guizhou,a torrential rain on June 13,2006 in Wangmo,Guizhou Province is analyzed.The direct impact system of the torrential rain,the evolution of mesoscale convective cloud clusters,the characteristics of Doppler radar echoes and physical characters are researched.The diagnostic results show that the heavy rain in a short time in Wangmo was caused by the vigorous development of meso-β cloud clusters,induced by the frontogenesis on a convergence line in the southwest of Guizhou under the impact of the rapidly southward moving of the cold air from Hetao.The region of heavy rainfall was directly linked to the convergence zone,where an energy front existed in low levels.Moist available potential energy was accumulated ahead of the front.The baroclinic disturbance induced the development of vorticity,leading to the intensive development of convective unstability.Radar echoes revealed typical mesco-scale characteristics of the torrential rain.