Analysis on the Causes of a Regional Rainstorm Process in Benxi from August 28 to 30,2011

According to the conventional meteorological data,U.S.NCEP reanalysis data,as well as the unconventional meteorological observation data by radar,FY-2E meteorological satellite and encryption automatic stations,the formation mechanism of a regional rainstorm process occurred from August 28 to 30,2011 in Benxi was analyzed.The results showed that the combination of the westerly trough and subtropical high was the dominant circulation system,southward retreat of weakened subtropical high was the focus of this precipitation forecast,while the moving and nature of 850 hPa shear line was the difficulty during the forecast process.The dynamic and thermal conditions of the rainstorm process were better,while moisture conditions was insufficient,low-level jet had not been established,the analysis of the meso-scale more clearly explained the evolution of this rainstorm process,providing a better theoretical basis for the rainstorm's analysis.