Graphical Abstract

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Shin, U., T.-Y. Lee, and S.-H. Park, 2019: Environment and processes for heavy rainfall in the early morning over the Korean peninsula during episodes of cloud clusters associated with mesoscale troughs. J. Meteor. Soc. Japan, 97, 633-655.
https://doi.org/10.2151/jmsj.2019-036   Graphical Abstract with highlights

Plain Language Summary: An investigation has been carried out using rainfall observation data, National Centers for Environmental Prediction (NCEP) Climate Forecast System Reanalysis (CFSR) analysis and forecast data to explain the environment and processes that lead to heavy rainfall in the early morning over the Korean peninsula during episodes of cloud clusters (CCs) associated with mesoscale troughs (CCMTs). For this study, nine episodes with maximum hourly rainfall amount in the early morning (i.e., 0300–0900 LST) are selected from seventeen heavy-rainfall episodes associated with CCMTs during 2001–2011.

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Highlights:

• Case studies on two episodes have revealed that, for both episodes, the growth of the strong southwesterly band (SWB; an area with wind speeds > 12.5 m s^-1) over the East China Sea is found to be the key processes for heavy rainfall in the early morning over the southwestern Korean peninsula. A mechanism for the SWB growth is presented in this paper.
• Furthermore, generality of the major results from the two case studies is verified using the results obtained for the composite fields of the 9 CCMT episodes.