沙漠与绿洲气象2024，Vol.18Issue(3)：40-46,7.DOI:10.12057/j.issn.1002-0799.2024.03.006
陕西商洛"6·30"强冰雹过程环境条件及雷达特征分析
Environmental Backgrounds and Radar Features of the"6·30"Severe Hail Process in Shangluo,Shaanxi Province
摘要
Abstract
This study presents a comprehensive analysis of an extreme convective weather event with hail that occurred in the southeastern part of Shaanxi on June 30,2022.Hourly characteristics were analyzed by combining ground-based data,Doppler radar observations,and ERA5(0.25°×0.25°)data.The results revealed a strong potential instability stratification caused by northward airflow behind a high-altitude cold vortex,which drove dry and cold air southward in the upper layers.This stratification combined with southwest warm and humid airflow in the lower layers,which provided favorable conditions for severe convection.Several factors,including strong low-level water vapor transport and convergence,convective effective potential energy,appropriate heights of the 0℃and-20℃isotherms,and moderate vertical wind shear in the 0-6 km layer,created a conducive environment for hail weather.The occurrence of severe convection was influenced by the cold air in the middle-upper level and ground cold pools.Adequate thickness of warm and cold clouds promoted the growth of hail particles,while strong updrafts facilitated the cyclic growth of small hail particles in supercooled water.The reflectivity factor map showed areas of three-body scattering,with the strongest reflectivity factor exceeding 65 dBZ.The profile map revealed a low-level weak echo area and a middle-high level echo overhang.The position of strong echo(＞50 dBZ)exceeded the height of the-20℃layer.The velocity chart exhibited mesocyclone characteristics.The echo top height provided guidance on the development and weakening of convection.A VIL jump of over 20 kg·m-2 served as an advance warning for hail weather.关键词
极端/冰雹/位势不稳定/三体散射/中气旋Key words
extreme/hail/potential instability/three body scattering/mesocyclone分类
天文与地球科学引用本文复制引用
郭莉,黄少妮,董淑珍,刘坤,井宇,郑亚宁..陕西商洛"6·30"强冰雹过程环境条件及雷达特征分析[J].沙漠与绿洲气象,2024,18(3):40-46,7.基金项目
陕西省气象局秦岭和黄土高原生态环境气象重点实验室开放研究课题(2022G-15) （2022G-15）
