Abstract
Influence of an Upper-level Trough on the Formation of a Baiu Frontal Depression that Caused a Torrential Rainfall Event in Southern Kyushu, Japan on July 4, 2020
Highlights
On July 4, 2020, record-breaking heavy rainfall in southern Kyushu, Japan caused landslides and flooding, resulting in catastrophic damage and fatalities
Earlier studies focused on large- and mesoscale environmental conditions, as well as the predictability of the July 2020 heavy rainfall events (Takaya et al 2020; Hirockawa et al 2020; Araki et al 2021; Duc et al 2021; Horinouchi et al 2021), this study explores the impact of the upper-level trough on the formation and development of the Baiu frontal depression (BFD) that caused heavy rainfall in southern Kyushu in July 2020
sea-level pressure (SLP) in numerical simulation without the upper-level trough (NOUT) was notably higher than that in control experiment (CNTL) between 2100 JST on July 3 and JST on July 4 (Fig. 3), suggesting that the upper-level trough largely contributed to the development of the BFD, resulting in heavy rainfall in southern Kyushu
Summary
On July 4, 2020, record-breaking heavy rainfall in southern Kyushu, Japan caused landslides and flooding, resulting in catastrophic damage and fatalities. Earlier studies focused on large- and mesoscale environmental conditions, as well as the predictability of the July 2020 heavy rainfall events (Takaya et al 2020; Hirockawa et al 2020; Araki et al 2021; Duc et al 2021; Horinouchi et al 2021), this study explores the impact of the upper-level trough on the formation and development of the BFD that caused heavy rainfall in southern Kyushu in July 2020.
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