大方县“2021·5·12”冰雹天气过程及人工防 雹作业分析

“2021.5.12”Hail Weather Process and Analysis of Artificial Hail Suppression Operations in Dafang County

利用常规气象观测资料和人工防雹作业信息,分析了大方县2021年5月12日出现的冰雹天气过程。结果表明:此次过程主要受切变线和地面辐合线的影响,“上干下湿”的大气层结在午后地面加热作用下触发强对流天气。12日傍晚至夜间,大方县8个人工防雹炮站作业28次,使用人雨弹562发,在作业区域的雷达回波强中心高度降低,强度减弱,防雹作业效果明显,但减弱后的回波在有利条件下二次增强。此次冰雹天气过程强度强,影响范围广,共造成大方县南部10个乡镇降雹,13612人受灾,直接经济损失2798.2万元。

Using conventional meteorological observation data and artificial hail suppression operation information,the hail weather process occurred on May 12,2021 in Dafang County was analyzed.The results showed that this process was mainly affected by shear lines and ground convergence lines,and the“dry up and wet down”atmospheric stratification triggers strong convective weather under the effect of ground heating in the afternoon.From the evening of the 12th to the night,8 artificial hail suppression gun stations in Dafang County operated 28 times,using 562 human rain bombs.The radar echo intensity in the operation area decreased in the center height,weakened in intensity,and the effectiveness of hail suppression operations was significant.However,the weakened echo was strengthened twice under favorable conditions.The hail weather process was strong and affected a wide range,causing hailstones in 10 towns and townships in the south of Dafang County,affecting 13612 people and causing a direct economic loss of 27982 million yuan.