The Characteristic Analysis of Heavy Rainfall in Sanmenxia during July 22-24 in 2010

The diagnostic analysis for the heavy rain process in Sanmenxia during July 22-24 in 2010 is carried out using the NCEP/NCAR reanalysis data and conventional observation data.The results show that the heavy rain areas confined in foreside of the vortex on low altitude and the strong wind belt of the south of the shearline,it makes the existence of strong convergence upward motion;there exists strong vortex motion in the west of the heavy rain areas,convergence of low level and divergence of higher level are dynamical condition of storm rainfall;in the radar basic speed products,it could analyze a lot typical mesoscale and small scale synoptic systems,these systems are a direct result of the high-intensity rainfall;the adverse wind area in the speed field(including low speed center) can distinguish rain and heavy rain area very well,rain will occur in the adverse wind area or affected zone around the place.