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《Plateau Meteorology》 2009-03
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Characteristic Analysis and Early-Warning of Tornado Supercell Storm

ZHEN Yuan-yuan1,ZHU Hong-fang1,FANG Xiang2,ZHANG Xue-cheng1,FANG Chong1,YAO Cheng1,HAO Ying1(1.Anhui Meteorological Observatory,Hefei 230031,China;2.National Satellite Meteorological Center,China Meteorological Administration,Beijing 100081,China)  
Usingthe Doppler radar data,three severe tornado processes occurred inAnhui were analyzed.The characteristics of Doppler base reflectivity in these F2~F3 tornados caused by supercell stormand the difference between tornado and hail supercellstormswere mainly studied.In addition,the meteorologicdata of 80 observations in Anhuiand the disaster dataof climate evaluation in past years,partlyfrom the disaster reportsof civil administration,were used.Based on these data,not only the space-time distributions and its variation trendof tornado processes,but alsothe circulation situationforming tornados from1960 up to nowwere researched.Theresults show that:(1) Tornados mainly occurred in plain places from east of Huaibei to east of Jianghuai region.The highest probabilityof tornados taking place were in July.(2) The supercell tornado occurred under the conditionof middleCAPE and severe vertical wind shear.Atthe same time its lifting condensation levelwas lower.(3) The three F2~F3 tornados all detected evere meso-cyclone and TVS(Tornadic Vortex Signature)at radar before and during occurrence.Comparing with non-tornado supercellstorm,the bottom height of meso-cyclonecausing severe tornados were obvious lower,mostly lower than 1 km.Atthe same timethe storm structure also had difference.The maximum reflectivityof supercell storm causing tornado is near to storm centroidat height,basicallyat 3 km or so,and the reflectivity was within 50~60 dBz.But for severe hail supercell storm,themaximum reflectivitywas higher than the storm centroidat heightbefore the storm disaster.When hailing,the height of maximum reflectivity became lower,but the height of storm centroidhad no change which was higher than the maximum reflectivity,keeping at 5 km or so and the reflectivity within60~70 dBz.
【Fund】: 国家高技术研究发展计划“多源卫星资料强对流监测与追踪方法研究”(2006AA12Z106);; 国家自然科学基金项目(40575014);; 中国气象局新技术推广项目(CMATG2007M35);; 安徽省十一五科技攻关项目(06013140B);; 2008年业务建设项目“灾害性天气短时临近预报预警业务系统建设与改进”共同资助
【CateGory Index】: P445.1
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