The cause analysis of Yingshan torrential rain on July 8,2010

Based on GFS data,LAPS products,the FY-2C satellite data,Doppler radar data and automatic station precipitation,Yingshan torrential rain on Jul 8,2010 is analyzed.The results show that when subtropical high which controlling Hubei retreat southward,the short wave trough which moving eastward on peripheral line is trigger of the process.Low level shear,jet and dew point front and surface concentrated line cause low level convergence,mid-level divergence,low level θse frontolysis and mid-high level frontal zone shift down,providing favorable dynamic conditions.High humidity range on 750—1 000 hPa provides vapor conditions.temperature trough,temperature ridge,increasing convective available potential energy and which the vertical structure of moist potential vorticity is high-positive and low-negative providing unstable energy.