A Bore-like Disturbance Observed in the Kanto Plain Area

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概要

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• Shortly before midnight of 28 November 1991, the Tokyo(Haneda)airport was hit by two wind bursts in short succession. These gusty winds were responsible for some aviation hazards the airport suffered from. This paper investigates the nature and cause(s)of this event, mainly through the analysis of autographic records from the meteorological observatories and AMeDAS(Automated Meteorological Data Acquisition System)data. It is found that abrupt changes in wind direction and speed occurred at the airport, when an isolated, mesoscale migrating disturbance impinged into a strong-low-level southwesterly flow associated with an extratropical cyclone. It is further revealed that the disturbance traveled across the central part of the Kanto Plain toward the east or southeast with the phase speed of 13-16ms^<-1>. Its horizontal dimension was roughly 30km, and the disturbance was accompanied by not only abrupt changes in wind, but also abrupt increases in pressure and temperature at the passage time of the disturbance. All these characteristics are common in the Morning-Glory-like bore, which is known to develop when a stable layer underlying a neutral layer is disturbed by an external disturbance. Thus, it is concluded that the disturbance detected in this case is a type of the internal bore. Its generating mechanism remains unclear, however. To the best knowledge of the authors, this is the first paper that documents a bore-like disturbance observed in Japan.

• 社団法人日本気象学会の論文
• 2001-12-25

著者

• OGURA Yoshimitsu

  Ocean Research Institute, The University of Tokyo

• Hoshino Kaoru

  Fukui Local Meteorological Observatory

• Ogura Yoshimitsu

  Ocean Research Institute University Of Tokyo

関連論文

• A Foehn Event Enhanced by the Synoptic Scale Dry Intrusion
• Evolution of a Typhoon-Like Subtropical Low Causing Severe Weather over the Kanto Area on 13 October 2003
• A Bore-like Disturbance Observed in the Kanto Plain Area
• Initiation and Evolution of a Subtropical Low Observed near the Japan Islands

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