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中文摘要：
当2007年8月18日夜间0709号超强台风圣帕（Sepat）靠近福建海岸时,23：07～23：20在其移动方向的右前方约300 km的温州市苍南县龙港镇衍生一强龙卷风,造成严重灾害。利用多普勒雷达探测分析该强龙卷,除密切关注有利于产生龙卷的天气背景条件,如不稳定天气过程、垂直风切变等外,还仔细分析了多普勒雷达观测的反射率因子、垂直风切变、相对风暴径向速度等要素,我们发现产生强龙卷风的一些典型特征,如像素到像素的速度切变、中气旋的形成等,要特别注意与龙卷有密切关系的低层中气旋的形成。在日常雷达探测业务中,除应密切注意中气旋预警外,还应仔细分析其识别参数如中气旋顶高、底高,顶高、底高直径等参数的演变趋势。多普勒雷达连续跟踪观测过程中,还需密切注意微涡旋的形成、演变过程。微涡旋的合并将会产生更大的微涡旋,该涡旋在受到迅速形成的对流母体上升气流的拉升作用时,易形成龙卷。同时,利用地面加密观测资料,探讨强龙卷风发生地的局地特征,如喇叭口地形辐合抬升,弱冷空气低层侵入,局地热源产生剧烈不稳定等动力和热力效应对衍生强龙卷风起重要的增强作用。
英文摘要：
When the super typhoon ＇Sepat＇ was close to off the Fujian coastline at the night of August 18,2007,a related tornado was derived in Longgang town,Cangnan county of Wenzhou region,about 300 km away in the direction of the typhoon moving forward at 23：07~23：20 BST.when detecting tornadoes and Tornados causing damages,which is a above F2 category one and is associated with the super cells using the Doppler radar,the close attention should be paid to carefully analyze the reflectance factor,vertical wind shear and storm-relative radial speed,the mesocyclone formation on lower levels,the merger of more microvortex and the local terrain features,apart from the synoptic background condition,e.g.,unsteady weather process and vertical wind shear.
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