Diagnostic analysis on "8.13" torrential rainstorm in Fushun in 2005

In term of weather chart and other live data,the primary physical factors forming the "8.13" torrential rainstorm in Fushun in 2005 were analyzed,including the characteristics of circulation,unstable energy,steam and power conditions and so on.And the impacts on evolvement process of cloud cluster,the application of numerical forecasting products and the special terrain to precipitation were also discussed in order to improve the forecasting ability to this kind of weather.The results indicated that west wind trough moved eastwards and tropical storm went northwards,which forced the subtropical high up north,and then the low level airflows were formed.The airflows provided lots of steam and unstable energy for the torrential rainstorm.The cold air converged with unstable energy in Fushun for shear line moved southeastwards,which made convection cloud cluster strong.Then the release of unstable energy around the edge of subtropical high formed the torrential rainstorm and strong thunderstorm weather.The terrain also played an important role.