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《Meteorological Monthly》 2008-10
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Mesoscale Analysis of a Torrential Rain in Sichuan and Chongqing

Kang Lan1 Feng Hanzhong1 Tu Nini2 Xiao Hongru1 Zhang Lihong2 (1.Sichuan Provincial Meteorological Observatory,CMA,Chengdu 610072; 2.Chengdu Institute of Plateau Meteorology)  
By using hourly Tbb data,lightning data,rainfall observations from automatic weather stations,the mesoscale characteristic of a torrential rain in Sichuan and Chongqing during July 16-20,2007 was analyzed in order to obtain valuable information on evaluating and predicting such case of torrential rain.The study shows that this case was a coupling result of two mesoscale systems which are Plateau Vortex and Southwestern Vortex.The strong and thick positive vortex column and the accompanying updraft are the main factors,which cause the convection bodies generate and eliminate in turn and lead to torrential rain to occur repeatedly in the nearby area.Three mesoscale cloud systems(MCS) in the southwestern vortex initiate the heavy rain directly.In this case,generation and elimination of the MCS and the convective clouds in the western Tibetan plateau performed in a way of seesaw.The movement direction of lightning can represent the direction of movement in strong convection zone,which is also the direction of movement of heavy rainfall in the future.The emergence of lightning is before the precipitation,a sudden increase or decrease of lightning have a certain significance to the increase or decrease of precipitation in the future.
【CateGory Index】: P458.121.1
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