气象2023，Vol.49Issue(11)：1328-1342,15.DOI:10.7519/j.issn.1000-0526.2023.053101
冷涡背景下山东省"5·17"极端强对流天气环境条件分析
Analysis of the Environmental Conditions of"5·17"Extremely Severe Convective Weather in Shandong Province Under the Background of Cold Vortex
摘要
Abstract
A large-scale extremely severe convective weather named"5·17"severe convection occurred in Shandong Province on 17 May 2020,and the hail coverage was the largest in the resent 10 years.The convective storms were highly organized.The regional supercell clusters and a strong squall line over 500 km in length caused this extremely severe convection.Based on ERA5 reanalysis data,automatic weather station data and Doppler weather radar data,the ambient conditions of this extremely severe convective weather are analyzed.The results show as follows.The cold vortex was located in the key area which was most conducive to the Shandong severe convection.The large-scale weather system forcing was strong,and the unusually strong cold air in the middle troposphere moved southward impacting the previously abnormally warm Shandong Province and resulting in the"5·17"extremely severe convection weather.The anomaly of weather system is more representative of the intensity of dynamic and thermal forcing,and when anoma-ly level is above 2σ,the extremely severe convection would be caused.When the intensity of the cold vor-tex weakened during its southward moving,accompanied by increasing anomaly,it may still cause ex-tremely severe convective weather in its southeast quadrant.The strong deep vertical wind shear was con-ducive to storms organization and development.The long axis of the squall line orientated the same direc-tion as the 0-6 km vertical wind shear vector.The area where new cells were generated,developed and merged was located in the front of the large value center of the wind vector difference.The low-level warm and moist advection continuously transported warm and humid air to Shandong,which was the mechanism of CAPE reconstruction and the main energy source for the long-term maintenance of supercell group and long squall line.关键词
极端强对流/高度组织化/天气尺度系统异常/CAPE重建Key words
extremely severe convection/highly organized/synoptic weather system anomaly/CAPE re-construction分类
大气科学引用本文复制引用
侯淑梅,朱晓清,史茜,唐巧玲,孟宪贵,刘畅,高荣珍,刁秀广..冷涡背景下山东省"5·17"极端强对流天气环境条件分析[J].气象,2023,49(11):1328-1342,15.基金项目
山东省自然科学基金项目(ZR2021MD010、ZR2022MD088)、山东省气象局精准预报技术创新团队(SDCXTD2021-1)、中国气象局预报员专项(CMAYBY2018-041)、中国气象局复盘总结专项(FPZJ2023-072)、山东省气象局重点课题(2022sdqxz11)、环渤海区域科技协同基金项目(QYXM202105)共同资助 （ZR2021MD010、ZR2022MD088）
