| 摘要: |
| 利用常规气象观测资料、多普勒雷达资料和FNL再分析资料等，对2020年4月17日发生在贵州省安顺市的一次局地性冰雹天气过程进行分析。结果表明：高原短波槽、中低层切变线、低空急流和地面辐合线是导致此次局地性强冰雹天气的主要影响系统，冰雹出现在850 hPa湿舌的顶端和地面高温中心附近；C波段雷达的反射率因子图上TBSS和前侧入流缺口共同出现，表征了大冰雹的产生，风暴单体具有明显的强回波悬垂和低层弱回波区，且大于50 dBz的强回波伸展高度明显超过-20 ℃层高度，表明了风暴在垂直方向强烈发展；VIL值在降雹前后有明显的变化，降雹前1~2个体扫VIL有跃增现象，降雹期间VIL≥30 kg·m-2，且在出现大冰雹时VIL≥50 kg·m-2，而在降雹结束后，VIL值迅速减小。 |
| 关键词: 冰雹；反射率因子；安顺 |
| DOI： |
| 投稿时间：2020-08-11 |
| 基金项目: |
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| Analysis of Environmental Background and Radar Product Characteristics of a Local Strong Hail Weather Process |
| ZENG Ni,DENG An,FANG Peng,WANG Xingju,HE Liyang,FAN Maolin |
| (Anshun Meteorological Bureau of Guizhou Province,Anshun 561000 ,China;Guangxi Zhuang Autonomous Region Meteorological Information Center,Nanning 530000 , China) |
| Abstract: |
| Based on the conventional meteorological observation data, Doppler radar data and FNL reanalysis data, a disastrous hail weather process occurred in Anshun, Guizhou Province on April 17, 2020 is analyzed. The results show that The plateau short-wave trough,the shear line in the middle and low level, the low level jet stream and the ground convergence line are the main influencing systems leading to the local strong hail weather process, the hail appears at the top of 850 hPa wet tongue and near the high temperature center on the ground.On the one hand, TBSS and the front inflow gap appear together on the reflectivity factor map of C-band radar, which indicates the generation of heavy hail. On the other hand, the storm cells had obvious strong echo overhang and weak echo zone in the low layer,and the strong echo extension height greater than 50 dBz is greater than -20 ℃ layer height, which indicates that the storm develops strongly in the vertical direction.VIL value had obvious changes before and after hail precipitation,One to two individuals scan VIL before hail fall, VIL≥30 kg·m-2 during hail fall, and VIL≥50 kg·m-2 in the presence of large hail fall, and VIL value decreases rapidly after hail fall. |
| Key words: the hail；reflectivity factor；Anshun |
