Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Characteristics of Mesoscale Convective Complexes that Triggered Heavy Rainfall Related to Severe Flash Flood in Luwu, Sulawesi, Indonesia

Version 1 : Received: 4 September 2021 / Approved: 6 September 2021 / Online: 6 September 2021 (11:06:17 CEST)

How to cite: Yulihastin, E.; Nuryanto, D.E.; Trismidianto, -.; Muharsyah, R. Characteristics of Mesoscale Convective Complexes that Triggered Heavy Rainfall Related to Severe Flash Flood in Luwu, Sulawesi, Indonesia. Preprints 2021, 2021090084 (doi: 10.20944/preprints202109.0084.v1). Yulihastin, E.; Nuryanto, D.E.; Trismidianto, -.; Muharsyah, R. Characteristics of Mesoscale Convective Complexes that Triggered Heavy Rainfall Related to Severe Flash Flood in Luwu, Sulawesi, Indonesia. Preprints 2021, 2021090084 (doi: 10.20944/preprints202109.0084.v1).

Abstract

A severe flash flood hit Luwu, Sulawesi, Indonesia, on 13 July 2020. This flood was preceded by persistent heavy rainfall from 11 to 13 July 2020. In this study, we explore both the physical and dynamical processes that caused the heavy rainfall using a convection-permitting model with 1-km resolution. The heavy rainfall was modulated by the development of a pair of Mesoscale Convective Complexes (MCCs) during the night. The pair of MCCs was triggered by an anti-cyclonic vorticity anomaly over the Makassar Strait and was maintained by the warm front passing between the sea and land over central Sulawesi. This front was characterized by moist-warm and cold-dry low-level air, which may have helped to extend the lifetime of the MCCs. The northwestward propagation of the MCCs was due to the interaction between predominantly southeasterly monsoon and sea surface temperature anomalies.

Keywords

mesoscale convective complex; heavy rainfall; warm front; sea surface temperature; eastern Maritime Continent

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