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Case Study on Development Mechanism of a Snowstorm over North China

Zhou Xuesong Tan Zhemin(Department of Atmospheric Sciences,Nanjing University,210093)  
By use of the next generation meso-scale non-hydrostatic model WRF,a backflow snowstorm over North China on Nov.24-26,2004 was simulated and analyzed.The development mechanisms of backflow precipitation are analyzed with the reasonable simulation results.The results show that dynamical frontogenesis plays a very important role in the development of backflow snowstorm.The frontogenetical secondary circulation directly causes the snowstorm.Mount Tai plays a very important role in the case and makes the positive and minus extremes of vertical velocity in the upslope and lee,respectively.Meanwhile it affects the distribution of rain water and cloud water.
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