X-band Dual-Polarization Radar Observations of the Supercell Storm that Generated an F3 Tornado on 6 May 2012 in Ibaraki Prefecture, Japan

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  • SUZUKI Shin-ichi
    National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan
  • MAESAKA Takeshi
    National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan
  • IWANAMI Koyuru
    National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan
  • SHIMIZU Shingo
    National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan
  • KIEDA Kaori
    National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan

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<p> X-band dual-polarization (multi-parameter) radars were used to observe a supercell storm that generated an F3 tornado in Ibaraki Prefecture, Japan on 6 May 2012. The observed data collected for this storm clearly exhibited the typical polarimetric features of a supercell storm, such as the ZDR (differential reflectivity) arc, ZDR column, and the KDP (specific differential phase) column, as well as their time evolution. The ZDR arc emerged at 10 to 15 min before the tornadogenesis. The ZDR column appeared approximately 1 h before the formation of the ZDR arc and was intermittent until tornadogenesis. As the ZDR arc appeared, the column became tall and stable and lasted until the dissipation of the tornado. These ZDR signatures of the supercell storm persisted for approximately half an hour.</p>

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