气象2017，Vol.43Issue(6)：745-755,11.DOI:10.7519/j.issn.1000-0526.2017.06.011
柳州"4·09"致灾冰雹的超级单体风暴过程分析
Analysis of Supercell Storm Leading to Disastrous Hail in Liuzhou on 9 April 2016
摘要
Abstract
Based on the Doppler weather radar data of Liuzhou and Guilin,and the conventional upper-air and surface observation data,this paper analyzes the environmental condition and radar echo structure of the severe hailstorm which occurred in Liuzhou on 9 April 2016.The results show that:(1)The back-ground responsible for the hailstorm includes intense heating-up of the surface which led to the develop-ment of thermal depression in the lower atmosphere,the developing eastward cold temperature trough in the mid-level,and an upper-level jet stream above the convective location.The convective clouds triggered by surface dryline and the mesoscale convergence line evolved into supercells under the influence of the un-stable stratification and significant vertical wind shear.(2 )The low-level reflectivity of the supercell showed a typical hook echo or inverted V-notch.Along the inflow direction and through the strongest ech-o,the reflectivity showed typical BWER,overhanging echo and echo wall.The strongest echo was within a vertical narrow zone along the echo wall and the value got to 65 dBz.The corresponding radial velocity in the lower atmosphere had a strong mesocyclone with rotation speed reaching 24 m·s-1 .The development and maintenance of mesocyclone made the supercell storm develop and maintain.(3 )Maximum reflectivity reaches 60 dBz,strong echo over 50 dBz extending to the height of -30℃ layer,VIL value over 60 kg·m-2and VIL density over 5 .0 g·m-3 ,mesocyclone in moderate or severe intensity can be taken as the early warning indicator of severe hail.关键词
冰雹/超级单体/中气旋/VIL值Key words
hail/supercell/mesocyclone/VIL (vertically integrated liquid)value分类
天文与地球科学引用本文复制引用
覃靖,潘海,刘蕾..柳州"4·09"致灾冰雹的超级单体风暴过程分析[J].气象,2017,43(6):745-755,11.基金项目
柳州市气象局自立项目(柳气科201602)资助 （柳气科201602）
