A rainstorm process in Ya'an on 21 August 2010 was studied using numerical simulation conducted by the WRF model. Comparison the simulated results and the fact demonstrates that WRF model could well simulates the spatial and temporal distribution of the precipitation process. Diagnostic analysis of this rainstorm using high spatial and temporal resolution simulation data were done. The result shows that: The blocking effect of the Tibetan Plateau makes the warm air along southwest of the subtropical high continuously transport to the basin, and a cyclonic circulation center forms over Ya'an region on 700 hPa. Strong upward motion was shown in the center of heavy rainfall in the main precipitation period from low-level to senior, and it maintains high-level divergence, low level convergence, high altitude negative vorticity and low altitude positive vorticity in the storm center. With the development of heavy rain, continuous enhancement of positive vorticity in the troposphere provides pretty favorable dynamic conditions for the generation and maintenance of a rainstorm. The wet air over the middle and lower troposphere, the strong transportation of moisture and the high and low level configuration of moisture flux divergence provide adequate moisture conditions. The atmospheric stratification of the lower troposphere is unstable, and the middle is a neutral, so this kind of potential instability supply thermal conditions for the occurrence of convective weather, and it is conducive to the formation of the heavy precipitation process at the same time.
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