By using the WRF model, NCEP 1°×1° reanalysis datasets and conventional observational data, numerical simulation and diagnostic analysis is performed for a heavy rainfall in Sichuan basin occurring during June 29th-July 2nd, 2013. The results showed the heavy rainfall was caused by the interaction of plateau vortex and southwest vortex, and the blocking effect formed by the west pacific subtropical high westward extension and stabilize in Sichuan Basin led to stagnate of plateau vortex and southwest vortex. WFR model can better simulate the affecting system, precipitation area and strength of the precipitation. θe analysis showed the heavy rainfall area was in the high temperature and high humidity area, and the lower level of the heavy rainfall area was convective instability area. Equivalent potential temperature was dense in the middle and upper level, and the isothermal surface of the equivalent potential temperature was steep. As the rainfall went on, the convective instability energy released, and the equivalent potential temperature declined. By using the convective vorticity vector (CVV) and moist vorticity vector (MVV), diagnostic analysis result of the heavy rainfall showed the vertical integration of the CVV and MVV vertical component and the trend of the positive cincture of the horizontal distribution was consistent with the precipitation area, and the maximum center could better correspond to the precipitation center. The distribution and development of the maximum area of the CVV and MVV vertical component was consistent with the movement and development of the precipitation area, the coincident positive distribution from low level to top level of the precipitation area was indicative to the heavy rainfall development. The CVV and MVV vertical component can well indicate the development and evolution of the heavy rainfall system in Sichuan Basin.
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