Early Detection of Baby-Rain-Cell Aloft in a Severe Storm and Risk Projection for Urban Flash Flood
In July 2008, five people were killed by a tragic flash flood caused by a local torrential heavy rainfall in a short time in Toga River. From this tragic accident, we realized that a system which can detect hazardous rain-cells in the earlier stage is strongly needed and would provide an additional...
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | Advances in Meteorology |
| Online Access: | http://dx.doi.org/10.1155/2017/5962356 |
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| author | Eiichi Nakakita Hiroto Sato Ryuta Nishiwaki Hiroyuki Yamabe Kosei Yamaguchi |
| author_facet | Eiichi Nakakita Hiroto Sato Ryuta Nishiwaki Hiroyuki Yamabe Kosei Yamaguchi |
| author_sort | Eiichi Nakakita |
| collection | DOAJ |
| description | In July 2008, five people were killed by a tragic flash flood caused by a local torrential heavy rainfall in a short time in Toga River. From this tragic accident, we realized that a system which can detect hazardous rain-cells in the earlier stage is strongly needed and would provide an additional 5 to 10 min for evacuation. By analyzing this event, we verified that a first radar echo aloft, by volume scan observation, is a practical and important sign for early warning of flash flood, and we named a first echo as a “baby-rain-cell” of Guerrilla-heavy rainfall. Also, we found a vertical vorticity criterion for identifying hazardous rain-cells and developed a heavy rainfall prediction system that has the important feature of not missing any hazardous rain-cell. Being able to detect heavy rainfall by 23.6 min on average before it reaches the ground, this system is implemented in XRAIN in the Kinki area. Additionally, to resolve the relationship between baby-rain-cell growth and vorticity behavior, we carried out an analysis of vorticity inside baby-rain-cells and verified that a pair of positive and negative vertical vortex tubes as well as an updraft between them existed in a rain-cell in the early stage. |
| format | Article |
| id | doaj-art-acfce9624b5d4b42bbfa584f41749ffb |
| institution | Kabale University |
| issn | 1687-9309 1687-9317 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Meteorology |
| spelling | doaj-art-acfce9624b5d4b42bbfa584f41749ffb2025-02-03T06:07:31ZengWileyAdvances in Meteorology1687-93091687-93172017-01-01201710.1155/2017/59623565962356Early Detection of Baby-Rain-Cell Aloft in a Severe Storm and Risk Projection for Urban Flash FloodEiichi Nakakita0Hiroto Sato1Ryuta Nishiwaki2Hiroyuki Yamabe3Kosei Yamaguchi4Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611-0011, JapanGraduate School of Engineering, Kyoto University, Uji, Kyoto 611-0011, JapanSumitomo Heavy Industries, Ltd., Shinagawa, Tokyo 141-6025, JapanTokyo Electric Power Company Holdings, Inc., Chiyoda, Tokyo 100-8560, JapanDisaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611-0011, JapanIn July 2008, five people were killed by a tragic flash flood caused by a local torrential heavy rainfall in a short time in Toga River. From this tragic accident, we realized that a system which can detect hazardous rain-cells in the earlier stage is strongly needed and would provide an additional 5 to 10 min for evacuation. By analyzing this event, we verified that a first radar echo aloft, by volume scan observation, is a practical and important sign for early warning of flash flood, and we named a first echo as a “baby-rain-cell” of Guerrilla-heavy rainfall. Also, we found a vertical vorticity criterion for identifying hazardous rain-cells and developed a heavy rainfall prediction system that has the important feature of not missing any hazardous rain-cell. Being able to detect heavy rainfall by 23.6 min on average before it reaches the ground, this system is implemented in XRAIN in the Kinki area. Additionally, to resolve the relationship between baby-rain-cell growth and vorticity behavior, we carried out an analysis of vorticity inside baby-rain-cells and verified that a pair of positive and negative vertical vortex tubes as well as an updraft between them existed in a rain-cell in the early stage.http://dx.doi.org/10.1155/2017/5962356 |
| spellingShingle | Eiichi Nakakita Hiroto Sato Ryuta Nishiwaki Hiroyuki Yamabe Kosei Yamaguchi Early Detection of Baby-Rain-Cell Aloft in a Severe Storm and Risk Projection for Urban Flash Flood Advances in Meteorology |
| title | Early Detection of Baby-Rain-Cell Aloft in a Severe Storm and Risk Projection for Urban Flash Flood |
| title_full | Early Detection of Baby-Rain-Cell Aloft in a Severe Storm and Risk Projection for Urban Flash Flood |
| title_fullStr | Early Detection of Baby-Rain-Cell Aloft in a Severe Storm and Risk Projection for Urban Flash Flood |
| title_full_unstemmed | Early Detection of Baby-Rain-Cell Aloft in a Severe Storm and Risk Projection for Urban Flash Flood |
| title_short | Early Detection of Baby-Rain-Cell Aloft in a Severe Storm and Risk Projection for Urban Flash Flood |
| title_sort | early detection of baby rain cell aloft in a severe storm and risk projection for urban flash flood |
| url | http://dx.doi.org/10.1155/2017/5962356 |
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