| 副热带高压外围西北侧一次强对流天气的雷达回波特征 |
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| 引用本文： | 龙利民,陈亮,江航东,姜玉印.副热带高压外围西北侧一次强对流天气的雷达回波特征[J].湖北气象,2007,26(1):68-72. |
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| 作者姓名： | 龙利民 陈亮 江航东 姜玉印 |
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| 作者单位： | 湖北省宜昌市气象局 宜昌443000(龙利民，陈亮，姜玉印)，厦门机场气象台 厦门361012(江航东) |
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| 摘 要： | 2005年7月15日14时到16日08时,宜昌市出现了一次强对流天气过程。根据宜昌多普勒天气雷达每6min一次体扫监测信息,分析了副热带高压外围西北侧强对流天气雷达回波的演变趋势。结果表明,在山地向平原过渡的地带,当对流云发展到最旺盛阶段并出现地面强降水时,在其基本反射率最低仰角产品中存在出流边界;弓形回波、带状回波的走向与环境风场几乎成正交时,给所经之地造成异常剧烈的天气,且灾害性大风均出现在径向速度场中具有旋转性环流的强单体移动的下风方。
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| 关 键 词： | 强对流天气 旋转环流 出流边界 弓型回波 |
| 文章编号： | 1004-9045（2007）01-0068-05 |
| 收稿时间： | 2006-12-06 |
| 修稿时间： | 2006-12-062007-03-12 |
The Radar Echo Characteristics of a Severe Convection in Northwest of Subtropical High |
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| LONG Li-min,CHEN Liang,JIANG Hang-dong,JIANG Yu-yin.The Radar Echo Characteristics of a Severe Convection in Northwest of Subtropical High[J].Meteorology Journal of Hubei,2007,26(1):68-72. |
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| Authors: | LONG Li-min CHEN Liang JIANG Hang-dong JIANG Yu-yin |
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| Institution: | 1.Yichaug Meteorological Bureau of Hubei Province, Yichaug 443000;2.Observatory of Xiamen Airdrome ,Xiamen 361012 |
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| Abstract: | A severe convection weather occurred in Yichang city during from 14:00, July 15th to 08:00, July 16th in 2005. Based on the volume scanning data of Yichang Doppler radar every 6 minutes, the evolvement of radar echo of convective cloud northwest to the Subtropical High is studied.The result shows that on the transition belt from mountain to plain, there exits a outlet boundary in the basic reflectivity product of the lowest elevation when the convective cloud develops to the most strongly stage and the heavy rain occurs. Extremely severe weather always occurs when bow echo or belt echo are vertical to the background wind field and the gale always occurs in the leeward of the moving direction of the strong cell with rotating circulation in radial velocity field. |
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| Keywords: | Severe convection Rotating circulation Outlet boundary Bow echo |
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