Multi-Scale Interaction between a Squall Line and a Supercell and Its Impact on the Genesis of the “0612” Gaoyou Tornado

Atmosphere

Fen Xu¹  Jiajia Tang²  Xiaowen Tang²  Fugui Zhang² 

[1] Nanjing Joint Institute for Atmospheric Sciences, Nanjing 210009, China;School of Meteorological Observation, Chengdu University of Information Technology, Chengdu 610225, China;

关键词: tornado;    squall line;    bow echo;    supercell;    storm interaction;   

DOI  :  10.3390/atmos13020272

来源: DOAJ

【 摘 要 】

The interaction between a squall line and a supercell and its impact on the genesis of a tornado that occurred in Gaoyou, Jiangsu Province, China on 12 June 2020 were analyzed using multi-source observations. The tornado formed as the result of an intensified meso-γ supercell in a favorable large-scale environment. The supercell developed in front of a squall line and slowly intensified after its formation. Due to its small size and weak intensity, the supercell did not produce any severe weather before the approaching of the squall line. As the squall line entered its mature stage with the formation of a well-organized bow echo, the supercell in front of the bow echo began to rapidly intensify and finally led to the tornado touchdown. The analysis of mesoscale and storm-scale wind fields indicated that the bow echo of the approaching squall line modified the kinematic fields near the supercell in such a way that was favorable for the intensification of the supercell. The interaction between the squall line and the supercell may have played a critical role in the occurrence of this tornado.

【 授权许可】

Unknown