Rapid-Scan and Polarimetric Phased-Array Radar Observations of a Tornado in the Pearl River Estuary |
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| Authors: | ZHANG Yu BAI Lan-qiang MENG Zhi-yong CHEN Bing-hong TIAN Cong-cong and FU Pei-ling |
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| Institution: | 1. Guangzhou Meteorological Observatory, China Meteorological Administration, Guangzhou 511430 China;
2. School of Atmospheric Sciences/ Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Zhuhai, Guangdong 519082 China;
3. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, Guangdong 519082 China;
4. Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871 China |
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| Abstract: | The strong destructive winds during tornadoes can greatly threaten human life and destroy property. The increasing availability of visual and remote observations, especially by Doppler weather radars, is of great value in understanding tornado formation and issuing warnings to the public. In this study, we present the first documented tornado over water detected by a state-of-the-art dual-polarization phased-array radar (dual-PAR) in China. In contrast to new-generation weather radars, the dual-PAR shows great advantages in tornado detection for its high spatial resolution, reliable polarimetric variables, and rapid-scan strategy. The polarimetric signature of copolar cross-correlation coefficient with anomalously low magnitude appears to be effective for verifying a tornado and thus is helpful for issuing tornado warnings. The Guangdong Meteorological Service has been developing an experimental X-band dual-PAR network in the Pearl River Delta with the goal of deploying at least 40 advanced dual-PARs and other dual-polarization weather radars before 2035. This network is the first quasi-operational X-band dual-PAR network with unprecedented high coverage in the globe. With such high-performance close-range PARs, efficient operational nowcasting and warning services for small-scale, rapidly evolving, and damaging weather (e.g., tornadoes, localized heavy rainfall, microbursts, and hail) can be expected. |
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| Keywords: | tornado waterspout phased-array radar dual-polarization China |
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