Early Detection of Baby-Rain-Cell Aloft in a Severe Storm and Risk Projection for Urban Flash Flood

Author:

Nakakita Eiichi1ORCID,Sato Hiroto2ORCID,Nishiwaki Ryuta3,Yamabe Hiroyuki4,Yamaguchi Kosei1

Affiliation:

1. Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan

2. Graduate School of Engineering, Kyoto University, Uji, Kyoto 611-0011, Japan

3. Sumitomo Heavy Industries, Ltd., Shinagawa, Tokyo 141-6025, Japan

4. Tokyo Electric Power Company Holdings, Inc., Chiyoda, Tokyo 100-8560, Japan

Abstract

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.

Funder

Japan Society for the Promotion of Science

Publisher

Hindawi Limited

Subject

Atmospheric Science,Pollution,Geophysics

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