Analysis on the Heavy Rainfall in Anhui Province in July 6,2013

[Objective] The research aimed to study the heavy rainfall in Anhui province in July 6,2013. [Method] Using conventional weather data and NCEP data,the weather situation,physical field,radar echo characteristics of the heavy rainfall were analyzed in Anhui province in July 6,2013. [Result]The intersection of Westerly trough guide cold air southward and southwest warm air of the northwest side of the subtropical high in Little caused the process of heavy rainfall. The enhancement of the southwest low level jet provides for ample moisture and thermal conditions for the storm area. The low-level convergence and upper-level divergence overlap in heavy rain area over,vertical upward motion is deep. The lower rainfall areas located positive vorticity area,high energy area of θse field,convergence centers of the negative divergence and the negative moisture convergence center of water vapor flux divergence. The 850 hPa wind field of heavy rainfall period was exported by numerical model WRF V3. 4,there is β mesoscale vortex system formed firstly in the southwestern region of Anhui and eastward along the shear line. When β mesoscale vortex system impact echo the form of pellets,compact structure,the reflectance factor was generally 30-35 dBz,echo top was 6-8 km,there were a number of strong center that the strength was 45 ~ 50 dBz and echo top was 12 km in groups like Echo.[Conclusion] The study provides the theoretical basis for the forecasts and predict of heavy rainfall.