Graphical Abstract

Tsuji, H., and Y. N. Takayabu, 2023: A hierarchical structure of the heavy rainfall event over Kyushu in July 2020. J. Meteor. Soc. Japan, 101.
Special Edition on Research on Extreme Weather Events that occurred around East Asia in 2017-2021
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Plain Language Summary: The heavy rainfall event in July 2020 over Kyushu Island, Japan is analyzed focusing on a hierarchical structure. Before the rainfall event, an upper tropospheric trough, a mesoscale depression, and a sub-synoptic scale cloud system prepare an environment favorable for organized precipitation systems bringing a large precipitation amount. At the rainfall event, a mesoscale convective system with moist absolutely unstable layers (MAULs) develops in Kyushu, causing the disastrous rainfall event. These results suggest that the rainfall event is characterized by a hierarchical structure such that the organized precipitation system causing the rainfall event develops under the environment generated by the upper-tropospheric trough, the sub-synoptic scale cloud system, and the mesoscale depression.