| 四川盆地南部边缘一次局地风雹天气的中尺度及雷达观测分析 |
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| 引用本文： | 王晓娟.四川盆地南部边缘一次局地风雹天气的中尺度及雷达观测分析[J].高原山地气象研究,2016,36(2):75-81. |
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| 作者姓名： | 王晓娟 |
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| 作者单位： | 四川省宜宾市气象台, 宜宾 644007 |
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| 摘 要： | 利用中尺度天气图分析方法和雷达资料分析了2015年5月7日盆地南部边缘一次强风雹天气过程。结果表明:1)在有利的天气尺度系统影响下,高低空冷暖平流叠加区域和中低层干线和湿舌交汇区域是强对流天气发生的落区;2)雷达回波显示,强对流风暴具有弓形回波、穹窿、弱回波区等冰雹回波特征,中层径向辐合和反射率因子核心的反复上升下降对形成地面大风和冰雹具有重要的指示意义,降雹前后VIL的突变对冰雹的预警也有重要的预警作用;3)地面大风与地形的关系密切,地形对大风的形成有很好的促进作用。
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| 关 键 词： | 强对流天气 冰雹 地面大风 中尺度分析 雷达探测 |
| 收稿时间： | 2016-04-20 |
Mesoscale and Radar Analysis on Sectional Windstorm Happened in South Sichuan Basin |
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| Affiliation: | Yibin Meteorology Bureau, Yibin 644007, China |
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| Abstract: | A strongstorm weather occurred in the south Sichuan basin on May 7th,2015 was analyzed using the mesoscale weather charts and the radar data. The results are the followings. The convective weather arises in the regions with the cold and warm advections overlaying and the intersections of the medium to low level mains under the influence of the favorable synoptic scale system,according to the analysis on the radiosonde and ground observations. The convection storm indicates the hail echo features such as the bow echo,the vault echo and the weak echo. It is an important indicator for predicting the strong wind and the hail when the radial convergence in the middle layer occurred and the radar reflectivity rose and fall repeatedly. The sudden change of the VIL happened before and after the hail can provide the early warning of the hail. The strong wind is connected with the topography,which can promote the strong wind. |
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