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《Journal of Arid Meteorology》 2010-03
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Analysis of Meso-scale Characteristic of the Squall Line on May 16,2009 in the North of Shaanxi

GAO Jie1,CUI Zhu'nan1,JIN Yingyan2,GONG Minying1 (1.Meteorology Center,Northwest Air-traffic Management Bureau,CAAC,Xi'an,710082,China;2.Meteorology Division,Northwest Air-traffic Management Bureau,CAAC,Xi'an,710082,China)  
Based on the conventional observation data,Doppler radar data and automatic meteorological station data,a squall line case occurred in the north of Shaanxi on May 16,2009 was analyzed.The result show that an unstable stratification with warm and humid air at the low level and cold and dry air at the upper level was a favorable condition for the storm,and the cold downdraft at the rearward of the storm was obvious.The storm had a structure of double convergence center on the divergence field,which could intensify the surface depression and the vertical updraft.The squall line had obvious meso-scale characteristics with meso-scale convergence line at low level identified from Doppler radial velocity chart,and the squall line was well correlation with dewpoint front,meso-scale depression and convergence line of wind field.
【CateGory Index】: P458.2
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