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      Characteristics of mesoscale-convective-system-produced extreme rainfall over southeastern South Korea: 7 July 2009

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      Natural Hazards and Earth System Sciences

      Copernicus GmbH

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          Abstract

          <p><strong>Abstract.</strong> An extreme-rainfall-producing mesoscale convective system (MCS) associated with the Changma front in southeastern South Korea was investigated using observational data. This event recorded historic rainfall and led to devastating flash floods and landslides in the Busan metropolitan area on 7 July 2009. The aim of the present study is to analyse the influences for the synoptic and mesoscale environment, and the reasons that the quasi-stationary MCS causes extreme rainfall. Synoptic and mesoscale analyses indicate that the MCS and heavy rainfall occurred in association with a stationary front which resembled a warm front in structure. A strong southwesterly low-level jet (LLJ) transported warm and humid air and supplied the moisture toward the front, and the air rose upwards above the frontal surface. As the moist air was conditionally unstable, repeated upstream initiation of deep convection by back-building occurred at the coastline, while old cells moved downstream parallel to the convective line with training effect. Because the motion of convective cells nearly opposed the backward propagation, the system as a whole moved slowly. The back-building behaviour was linked to the convectively generated cold pool and its outflow boundary, which played a role in the propagation and maintenance of the rainfall system. As a result, the quasi-stationary MCS caused a prolonged duration of heavy rainfall, leading to extreme rainfall over the Busan metropolitan area.</p>

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                Author and article information

                Journal
                Natural Hazards and Earth System Sciences
                Nat. Hazards Earth Syst. Sci.
                Copernicus GmbH
                1684-9981
                2016
                April 12 2016
                : 16
                : 4
                : 927-939
                10.5194/nhess-16-927-2016
                © 2016

                https://creativecommons.org/licenses/by/3.0/

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