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Synoptic Environment Associated with Extreme Heavy Snowfall Events in the Yeongdong Region

영동 지역의 극한 대설 사례와 관련된 종관 환경

  • Kwon, Tae-Yong (Dept. of Atmospheric and Environmental Sciences, Gangneung-Wonju National University) ;
  • Cho, Young-Jun (Forecast Research Laboratory, National Institute of Meteorological Research) ;
  • Seo, Dong-Hee (Dept. of Atmospheric and Environmental Sciences, Gangneung-Wonju National University) ;
  • Choi, Man-Gyu ;
  • Han, Sang-Ok (High Impact Weather Research Center, Forecast Research Laboratory, National Institute of Meteorological Research)
  • 권태영 (강릉원주대학교 대기환경과학과) ;
  • 조영준 (국립기상연구소 예보연구과) ;
  • 서동희 (강릉원주대학교 대기환경과학과) ;
  • 최만규 ;
  • 한상옥 (국립기상연구소 예보연구과 재해기상연구센터)
  • Received : 2014.04.17
  • Accepted : 2014.05.30
  • Published : 2014.09.30

Abstract

This study presents local and synoptic conditions associated with extreme heavy snowfall events in the Yeongdong region, as well as the temporal and spatial variability of these conditions. During the last 12 years (2001~2012), 3 extreme snowfall events occurred in the Yeongdong region, which recorded daily snowfall greater than 50 cm, respectively. In these events, one of the noticeable features is the occurrence of heavy hourly snowfall greater than 10 cm. It was reported from satellite analysis that these heavy snowfall may be closely related to mesoscale convective clouds. In this paper the 3 extreme events are examined on their synoptic environments associated with the developments of mesoscale convective system using numerical model output. These 3 events all occurred in strongly forced synoptic environments where 500 and 300 hPa troughs and 500 hPa thermal troughs were evident. From the analysis of diagnostic variables, it was found in all 3 events that absolute vorticity and cold air advection were dominant in the Yeongdong region and its surrounding sea at upper levels, especially at around 500 hPa (absolute vorticity: $20{\sim}60{\times}10^{-5}s^{-1}$, cold air advection: $-10{\sim}-20^{\circ}C$ $12hr^{-1}$). Moreover, the spatial distributions of cold advection showed mostly the shape of a narrow band along the eastern coast of Korea. These features of absolute vorticity and cold advection at 500 hPa were sustained for about 10 hours before the occurrence of maximum hourly snowfall.

Acknowledgement

Grant : 재해기상연구센터 설립.운영

Supported by : 국립기상연구소

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  2. Analysis of the Relationship of Water Vapor with Precipitation for the Winter ESSAY (Experiment on Snow Storms At Yeongdong) Period vol.26, pp.1, 2016, https://doi.org/10.14191/Atmos.2016.26.1.019
  3. High-Resolution Simulation of Snowfall over the Korean Eastern Coastal Region Using WRF Model: Sensitivity to Domain Nesting-Down Strategy pp.1976-7951, 2019, https://doi.org/10.1007/s13143-019-00108-x