巴彦淖尔市“8.16”局地大暴雨过程诊断分析 |
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引用本文: | 王永清,张连霞,梁凤娟,李晓东.巴彦淖尔市“8.16”局地大暴雨过程诊断分析[J].内蒙古气象,2009(4):9-11. |
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作者姓名: | 王永清 张连霞 梁凤娟 李晓东 |
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作者单位: | 巴彦淖尔市气象局,内蒙古,巴彦淖尔,ot5000 |
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摘 要: | 文章利用常规气象观测资料、数值预报产品和自动站资料,对2008年8月15-18日发生在巴彦淖尔市一次局地大暴雨天气过程进行诊断分析。结果表明:(1)在降水前期,位于贝湖脊下深厚的“高压盖”将500hPa西南水汽和700hPa东南水汽拦截在河套南部,为暴雨产生聚集了水汽;(2)从孟加拉湾经四川伸向巴彦淖尔市的高能、高湿舌,为暴。雨形成输送了潜在的不稳定能量;(3)西伸副高与东移的贝湖高压脊叠加建立的东高西低环流背景,为强降水在暴雨区滞留起到了阻挡作用:(4)500hPa西来小槽推开“高压盖”后产生的辐合上升区和700hPa切变线叠加后,与200hPa高空急流出口处左侧辐散槽区在巴彦淖尔市上空叠置,是形成暴雨的动力抬升条件,也是产生本次暴雨的触发机制。高、中、低层中、小尺度切变、辐散、辐合流场垂直叠置,高能、高湿、强辐合、强上升区同时具备,是本次暴雨的预报着眼点。
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关 键 词: | 高空急流 切变线 诊断分析 |
A Diagnostic Analysis on "8.16" Local Torrential Rain Process in Bayannur |
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Authors: | Wang Yongqing Zhang Lianxia Liang Fengjuan Li Xiaodong |
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Institution: | Bayannur Meteorological Bureau;Bayannur 015000 |
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Abstract: | This article used convention meteorological observation data,the product of numerical forecasting and the data of automatic station,the weather process of torrential rain that occur on August 15-18,2008 in Bayannur was diagnostic analyzed.The results showed:(1)At the prior period of precipitation,the thick "high-pressure-cover" that under Baikal Lake pressure ridge headed off the 500hpa southwest vapor and the 700hpa southeast vapor in south of Hetao,and collected the vapor for torrential rain;(2)The tongue... |
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Keywords: | Upper-level jet stream Shear line Diagnostic analysis |
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