Structure, Maintenance and Development of a Stationary Convective System Generated over a Mountain Slope Adjoining a Bay in Summer

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  • SANO Tetsuya
    International Research Center for River Basin Environment, University of Yamanashi
  • OISHI Satoru
    Research Center for Urban Safety and Security, Kobe University
  • SUNADA Kengo
    International Research Center for River Basin Environment, University of Yamanashi

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In the present study, a stationary convective system persisting for approximately six hours over the Asagiri Highland adjoining Suruga Bay, Japan on 28 July 2010 was investigated primarily using X-band multi-parameter radar observation data. Over the Asagiri Highland with the moist southerly wind from Suruga Bay associated with thermally induced local circulations, 54 precipitating cells were generated continuously. The anvil extending southeastward from the existing precipitating cells did not prevent new precipitating cells from continuous appearance. Thus, the convective system was maintained for approximately six hours. Then, small advection of the transient cells contributed to the formation of a convective system with a horizontal scale of approximately 20 km. Among them, the precipitating cells that appeared over the gradual slope toward Mt. Kenashi, which is located in the western part of Asagiri Highland, moved toward the northwest part of Mt. Fuji. The precipitating cells were supplied with sufficient moisture because the direction was normal to that of moist southerly wind blowing from Suruga Bay. In one of those precipitating cells, two cores were identified. One was associated with a shallow convection below the melting level, and the other with a deep convection. They rained on almost the same position in the precipitating cell. The precipitating cell with such cores brought a localized heavy rainfall by efficiently converting the moisture transported from Suruga Bay into rain.

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  • 気象集誌. 第2輯

    気象集誌. 第2輯 90 (5), 807-831, 2012

    公益社団法人 日本気象学会

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