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Korean Meteorological Society (한국기상학회)
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A Case Study of Heavy Rainfall by A Developed Convective System over Gangneung on 6 August 2018

2018년 8월 6일 발달한 대류계에 의해 발생한 강릉지역의 집중호우 사례 연구

  • Park, Sung-Kyu (Department of Atmospheric and Environmental Sciences, Gangneung-Wonju National University) ;
  • Lee, Jae Gyoo (Department of Atmospheric and Environmental Sciences, Gangneung-Wonju National University)
  • 박성규 (강릉원주대학교 대기환경과학과) ;
  • 이재규 (강릉원주대학교 대기환경과학과)
  • Received : 2020.03.02
  • Accepted : 2020.06.06
  • Published : 2020.06.30
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Abstract

On 6 August 2018, heavy rainfall of daily precipitation of more than 200 mm occurred in the Yeong-dong coastal area, and especially, 1-hour precipitation of 93 mm (0251~0351 LST (local standard time) 6 August) at Gangneung station, ranked second in the history of meteorological survey of the station. In this study, this heavy rainfall case over the Gangneung area would be studied to investigate the process in which the heavy rainfall occurred. A developed ridge moved toward the Yeong-dong coastal area from the Maritime Province in Russia. The approaching of the ridge led to the northeasterly cold wind over the coastal region, causing the collision between the incoming northeasterly cold wind, and the humid and warm (convectively unstable) air located over the Yeong-dong area. This collision led to a strong convergence (maximum -206 × 10-5 s-1) at 925 hPa level over the vicinity of Gangneung at 0300 LST 6 August, resulting updraft of up to about 4.4 m s-1 at 700 hPa level over the area. This strong updraft forced to lift rapidly the convectively unstable, warm and humid air layer, located over the vicinity of Gangneung, leading to the heavy rainfall (1-hour precipitation of 93 mm) over the area.

Keywords

References

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