A Heavy Rainstorm Weather Process Analysis during Jul.16- 17,2012 in Xiangtan

Using conventional observation data,NCEP analysis data,satellite imagery,radar data,numerical forecast product data,comprehensive analysis and numerical validation was conducted on a heavy rainstorm weather process in Xiangtan during Jul.16- 17,2012.The results showed that the rainstorm in the action of the upper trough,the lower level shear and surface cold air,typical dual structure corresponding to the heavy precipitation area a development from the ground to the tropopause,positive and negative vorticity column coupling,positive and negative divergence column coupling,tectonic dynamic mechanism of rainfall characteristics;radar echo strength is not strong and uniform distribution,but its long duration,while the speed chart large range and rainstorm fall area has a good corresponding relationship;The forecasting effects of T639,Germany,Japanese numerical forecast precipitation products on the precipitation process of falling area are good.