Multi-source analysis of severe convection weather induced by a supercell storm in Hengshui

Abstract

The severe convection weather induced by a supercell storm in Hengshui from north to south on June 13th, 2018 was analyzed by using the meteorological data from MICAPS, the data of the microwave radiometer from Hengshui Meteorological Bureau, the data of wind-profiling radar in Jizhou District of Hengshui, the data of the Doppler radar in Shijiazhuang, and the data of the dual polarization radar in Raoyang County of Hengshui. The results showed thatthe process was a severe convective weather triggered by a supercell storm, which triggered by the intersection of high-level dry and cold air with low-level warm and humid air in the rear of a vortex , and was dominated by hail, thunderstorm and strong wind. Hengshui had maintained an unstable stratification with cold-dry air on the top and warm-humid air on the bottom before the storm was born. The 0°C layer and the -20°C layer were at suitable heights, thus providing a favorable environment for the occurrence and development of severe convection. The northerly wind current in the middle and upper levels had played a good role in pumping and ventilating the current, which increased the transportation of cold and dry air in the middle and upper levels, thereby further increasing the vertical wind shear in the upper and lower levels, and eventually causing the stratification to became even less stable. As the low-level shear line transited, the unstable energy was triggered, which in turn maintainedthe strength of the severe convective weather. The data of the dual-polarized radarcould better describe the particle size, particle shape, and precipitation type, as well as detect and warn of the hail area. By integrating the data of the dual-polarized radar and the Doppler radar, early warning signals of hail could be sent about 66 minutes earlier. Keywords— supercell storm, hail, microwave radiometer, wind-profiling radar, doppler radar, dual polarization radar 摘要—利用 micaps 气象资料以及衡水市气象局微 波辐射计资料、衡水市冀州区风廓线雷达资料、石 家庄市多普勒雷达资料、衡水市饶阳县双偏振雷达 资料对 2018年 6月 13日衡水市自北向南出现的一 次超级单体风暴引发强对流天气过程进行分析。结 果表明:此次过程是一次涡槽后部高层干冷空气与 低层暖湿气流交汇触发超级单体风暴引发的强对 Fourth Symposium on Disaster Risk Analysis and Management in Chinese Littoral Regions (DRAMCLR 2019) Copyright © 2019, the Authors. Published by Atlantis Press. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/). Advances in Intelligent Systems Research, volume 171