A Hierarchical Structure of the Heavy Rainfall Event over Kyushu in July 2020

The precipitation system and environment causing the heavy rainfall event in July 2020 over Kyushu Island, Japan are analyzed focusing on a hierarchical structure. moisture budget analysis reveals contribution of free-tropospheric flux convergence moistening atmosphere before event. Further analyses by dividing into moisture-advection wind-convergence terms indicate that controlled moistening. Contributions both boundary-layer increase after Wide areas with weak characterize phase, whereas concentrated intense develop A synoptic scale upper-tropospheric trough transports from South China Sea to via southern China. converges sub-synoptic cloud front trough, providing moist favorable for systems bringing large amount precipitation. mesoscale depression below developed active convection central enhances transport. Cyclonic circulations associated enhance baroclinicity around Kyushu. An convective area develops covering under such conditions. line-shaped is generated along edge system, Two embedded inflow direction. At same time, spread downstream areas. vertical cross-sections show structures consistent organized deep layers absolutely unstable layers. These results suggest prepared