Syeliga Nur Fadilla, Nofi Yendri Sudiar, Trismidianto
As we enter the transition season, Indonesia is often hit by the hail phenomenon. One of them was on April 12, 2020, when the phenomenon of hail accompanied by strong winds hits the Laguboti area of Toba Regency, which was identified as being due to the Mesoscale Convective Complex (MCC). This research aims to analyze the MCC mechanism for triggering hail and strong winds in this case study. This study used the Global Satellite Mapping of Precipitation (GSMaP) data, Himawari-8 satellite image data, and reanalysis data from the European Center for Medium-Range Weather Forecasts (ECMWF) ERA5. The results of this research indicate that the MCC that occurred was triggered by strong surface convergence toward the south and was supported by strong mountain winds. The strengthening of surface convergent winds supports the MCC development until it reaches a maximum of 07 local time (LT). New convective cells that appeared after the MCC decay triggered the development of convective clouds in several areas of Sumatra Island. This new convective cells formation triggered heavy rain and even hail in Laguboti, followed by strong winds. The impact of MCC on rainfall also spreads around the area where MCC occurs. The hail above Laguboti was formed due to the confluence of a strong updraft and a strong downdraft above the area, which was also visible during the development of the MCC. The strong winds that occur in Laguboti are due to the convergence center at the Laguboti location. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang (UNP), West Sumatra, Padang, Indonesia; Research Center for Climate and Atmospheric, National Research and Innovation Agency, Bandung, 40173, Indonesia
