Radar Observations of Tornado-Warned Convection Associated with Tropical Cyclones over Florida
Radar Observations of Tornado-Warned Convection Associated with Tropical Cyclones over Florida
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佛罗里达州上空与热带气旋相关的龙卷风警告对流的雷达观测
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
S. M. Martinaitis
中科院分区：
文献类型：
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作者：
S. M. Martinaitis
摘要对近年来热带气旋事件中发布的龙卷风预警进行统计评估，得出了高于平均水平的误报率。本研究利用位于佛罗里达半岛各地的气象监测雷达-1988多普勒雷达的超分辨率和双极化数据，分析了与热带风暴Debby（2012）和Andrea（2013）相关的龙卷风预警对流，以识别在龙卷风形成之前区分龙卷风事件的前兆特征和特征。在不影响探测概率的前提下，提出了一系列基于雷达的不同距离雷达询问制导，有助于降低龙卷风预警虚警率。对于距离最近的雷达74.1 km范围内的对流，低层速度特征包括转速≥10.3 m s - 1 (20 kt)，横切≥0.010 s - 1，以及收缩的旋转直径。对流也应该表现出超级单体的反射率特征，至少…
AbstractStatistical evaluations of tornado warnings issued during recent tropical cyclone events yielded an above-average false alarm ratio. This study analyzed tornado-warned convection associated with Tropical Storms Debby (2012) and Andrea (2013) using superresolution and dual-polarization data from Weather Surveillance Radar-1988 Doppler radars located throughout the Florida peninsula to identify precursor characteristics and signatures that would distinguish tornadic events prior to tornadogenesis. A series of radar-based interrogation guidance at varying ranges from radar is presented to help facilitate the reduction of the tornado-warning false alarm ratio without compromising the probability of detection. For convection within 74.1 km from the nearest radar, low-level velocity characteristics include a rotational velocity ≥ 10.3 m s−1 (20 kt), shear across the rotation ≥ 0.010 s−1, and a contracting rotation diameter. The convection should also exhibit supercell reflectivity signatures and at leas...