Evolution Characteristics of a Local Strong Hailstorm in Shandong Peninsula  

作　　者：Zhang Can Mei Chanjuan Xu Ke 

机构地区：[1]Weihai Meteorological Bureau,Weihai 264200,China [2]Meteorological Station of Air Force,Weifang 261500,China

出　　处：《Meteorological and Environmental Research》2019年第6期9-15,共7页气象与环境研究（英文版）

基　　金：Supported by the Special Project for Forecaster of Shandong Meteorological Bureau(SDYBY2016-10)

摘　　要：On May 28,2018,a strong hailstorm accompanying gale(with speed of 17 m/s)and hail(with the maximum diameter of 42 mm)occurred in Yantai in Shandong Peninsula.Based on the conventional weather observation,Doppler weather radar,and automatic weather station data,the evolution characteristics of the strong hailstorm in Shandong Peninsula were analyzed.The results show that this multi-cell strong storm occurred under the background of high-altitude cold vortex.The strong cold advection at the middle and high altitudes and the weak warm advection at the low altitude formed a strong unstable stratification,and also led to cooling at the middle altitudes at the same time.The height of 0 and-20℃dropped significantly,which provided better environmental conditions for the growth of hail in the air.The lower temperature 0℃also ensured less melting of hail during falling,and the middle dry layer was conducive to the formation of thunderstorm gale.The vertical wind shear above medium intensity was the development and maintenance mechanism of thunderstorm cells gradually evolving into a strong hailstorm.From the analysis of radar echo characteristics,it is found that it was a strong hailstorm weather process caused by the linear multi-cell storm.The thunderstorm cells that could produce large hail occurred and developed,and the whole process lasted for 2 h under the triggering of the convergence line formed by the interaction of the sea breeze front and ground cold front.It had obvious characteristics of hail such as three-body scattering spikes,side-lobe echoes,high-hanging strong echoes,as well as the characteristics of thunderstorm gale such as arcuate echoes,middle-level radial convergence,and back side inflow.The storm development process was accompanied by backward propagation,but the long axis of the line storm was basically perpendicular to the movement direction of the storm,so there was no short-term heavy precipitation.The stratification instability conditions,water vapor conditions and ground convergence conditOn May 28,2018,a strong hailstorm accompanying gale( with speed of 17 m/s) and hail( with the maximum diameter of 42 mm) occurred in Yantai in Shandong Peninsula. Based on the conventional weather observation,Doppler weather radar,and automatic weather station data,the evolution characteristics of the strong hailstorm in Shandong Peninsula were analyzed. The results show that this multi-cell strong storm occurred under the background of high-altitude cold vortex. The strong cold advection at the middle and high altitudes and the weak warm advection at the low altitude formed a strong unstable stratification,and also led to cooling at the middle altitudes at the same time. The height of 0 and-20 ℃dropped significantly,which provided better environmental conditions for the growth of hail in the air. The lower temperature 0 ℃ also ensured less melting of hail during falling,and the middle dry layer was conducive to the formation of thunderstorm gale. The vertical wind shear above medium intensity was the development and maintenance mechanism of thunderstorm cells gradually evolving into a strong hailstorm. From the analysis of radar echo characteristics,it is found that it was a strong hailstorm weather process caused by the linear multi-cell storm. The thunderstorm cells that could produce large hail occurred and developed,and the whole process lasted for 2 h under the triggering of the convergence line formed by the interaction of the sea breeze front and ground cold front. It had obvious characteristics of hail such as three-body scattering spikes,side-lobe echoes,high-hanging strong echoes,as well as the characteristics of thunderstorm gale such as arcuate echoes,middle-level radial convergence,and back side inflow. The storm development process was accompanied by backward propagation,but the long axis of the line storm was basically perpendicular to the movement direction of the storm,so there was no short-term heavy precipitation. The stratification instability conditions,water vapor conditions and ground

关 键 词：HAIL THREE-BODY scattering spike BOW echo Evolution characteristics SHANDONG PENINSULA 

分 类 号：P73[天文地球—海洋科学]