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Multiscale Atmospheric Drivers of the April 2023 Cilacap Flood: Insights from Himawari-9 RGB Imagery and Radiosonde Data Aminuddin, Jamrud; Susanti, Sri; Mardika, Adnan Dendy; Darmawan, Arief
Journal of the Physical Society of Indonesia Vol. 2 No. 1 (2026): April 2026
Publisher : The Physical Society of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35895/jpsi.2.1.25-33.2026

Abstract

This study analyzes the atmospheric drivers of extreme rainfall during the 27 April 2023 flood event in Cilacap, Indonesia, using satellite, reanalysis, and in situ data. Convective evolution was examined using rainfall records, Himawari-9 cloud-top temperatures, instability indices (CAPE, CIN, KI, TTI), and surface wind fields. Rainfall exceeded 135 mm from the afternoon to nighttime. Satellite observations showed rapid convective growth, with cloud-top temperatures dropping below −75 °C, indicating mature Cumulonimbus clouds. The 24-Hour Night Microphysics RGB imagery revealed convective initiation around 08:00 UTC and intensification during the evening. Atmospheric instability increased prior to the event, with CAPE exceeding 1600 J kg⁻¹ between 09:00 and 12:00 UTC, while CIN decreased below 80 J kg⁻¹. Surface wind analysis identified a strong low-level convergence zone formed by moist onshore flow from the Indian Ocean interacting with inland winds. This convergence provided dynamical lifting that released the stored instability, triggering deep convection that peaked around 15:00 UTC. The results show that the extreme rainfall was driven by the coupling of high thermodynamic instability and local moisture convergence, demonstrating the value of combining NWP products and satellite RGB imagery for diagnosing coastal extreme rainfall.
Co-Authors Agustin, Evi Avicenna Agustin, Melly Al-Aqsha, L. Moh. Riri Rivari Ali Djamhuri Aminuddin, Jamrud Amril, La Ode Anayati, Wan Anissa, Meiza Ariani Trisna Murti Arief Darmawan Atin Kurniawati Atmajayanty, Shary Agustine Atman, B. Eggy Tamara Avicenna, Evi Azizah, Asa Nur Bradley, Bradley Chairanda, Mutiara Devid Dwi Erwahyudin DIAN LESTARI Dwirahayu, Yayuk E. Marhaeniyanto Emy Wuryani ERYANSYAH, ERYANSYAH Ezir, Ely Firdaus Firdaus Fitri Damayanti Fitri, Halima Fitri, Halimah Hamdani Abdi, Yusuf Hasruddin Indah Pujiastuti Indrayatti, Wahyu Islamia, Nurul Dian Istiningsih, Titik Iswati, Nunung Jauhari, M. Abim Judaty , Mitsalina Durrah Jumiati Jumiati Khodijah, Nurul Kristiningrum, Kristiningrum Lestari, Wiwik Putri Eni Lilik Purwanti Lina Marliana Hidayat Made Yudi Darmita Madi, Darlian Rambu Maenarni, Lilis Manahan, Olven Mardika, Adnan Dendy Marsiwi, Dwiati Miftahuddin Miftahuddin Nabila, Siti Maulidiya Nasir Usman Nasriati, Ririn Nilam Sari Ningsih, Ruri Puspita Niswanto Niswanto, Niswanto Nurfatimah, Diah Nurjannah Nurjannah Nurul Aisyah Nurul Isnaeni Oman Sukmana Patty, Edison F.J. Pertiwi, Hanna Prasetya, Fikki Prasetyo, Nanda David Prastuti, Aulia Widya Pratama, Adhitya Agustian Pricilia, Linda Purba, Christina Rakhman, Amalia Ramadhan Tosepu Rasyd, Anwar Regilta, Windy Wiga Rozana, Salma Rusman Rusman Rusmi Saiful Nurhidayat, Saiful Sinaga, Jholant Bringg Luck Amelia Br Siti Munawaroh Siti Zubaidah Sitompul, Ria Lestari Sri Mulyati Sri Wulan, Sri Sumarno . Supartini, N Susilo, Rahmad K. Dwi Syahmi Edi Syamsul Arifin Syifaul Janan Tiara Kusuma Dewi, Tiara Kusuma Wahyu Purwiyastuti Widya, Rika Yalvema Miaz Yulita Pujilestari