Analysis for Effects of Vortex and Jet Stream during a Rainstorm

Based on the rain gauge data at automatic weather stations,conventional observations,FY- 2D TBB satellite pictures and NCEP analysis data,the rainstorm in Suining city caused by the coupling interaction between Plateau and southwest vortexes from 30 Jun to 2 July in 2013 were analyzed. In this paper main analyzed the coupling interaction between Plateau and southwest vortexes impact on the heavy rain and evolution of the Low- level jet and Its relationship with the heavy rainfall.The results show that the altitude vortex development to strengthen when the coupling interaction between Plateau and southwest vortexes and stimulate the production of heavy rain in Suining city. Jet provided energy for the development of altitude vortex.Low altitude jet and low- level jet will not certainly immediately cause a strong rainfall,sometimes this process will be delayed two hours. The degree of increase in the low- level jet index(I) and the intensity of rainfall have a direct proportional relationship.