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All Journal Pillar of Physics: Jurnal Berkala Ilmiah Fisika Jurnal Kolaboratif Sains
Alghazali, Muhammad Fathurrachman
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Identification of Mesoscale Convective System Phenomena in Relation to Heavy Rain in Semarang (Case Study of the Squall Line on March 13, 2024) Cahya, Shintia Dwi; Halawa, Reinal Taruna Wahyu; Alghazali, Muhammad Fathurrachman; Saifulloh, Naufaldi; Kristianto, Aries
PILLAR OF PHYSICS Vol 18, No 1 (2025)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/17058171074

Abstract

Indonesia, located in the equatorial region, experiences complex rainfall variability influenced by various climatic and geographic factors. Mesoscale Convective Systems (MCS), including squall lines, are a significant contributor to extreme weather phenomena such as heavy rainfall and strong winds. This study investigates the mesoscale convective system (MCS) phenomenon, focusing on its formation, atmospheric dynamics, and associated rainfall distribution. This research investigates the squall line phenomenon, specifically focusing on a squall line event in Semarang, Indonesia, on March 13, 2024. Utilizing data from Himawari-8 satellite imagery, ERA5 reanalysis, and GSMaP rainfall observations, the research identifies the development, atmospheric dynamics, and rainfall intensity of the squall line. Satellite imagery analysis revealed the squall line's linear pattern with cloud top temperatures below -60°C, forming during intense convective activity. Atmospheric instability indices, including CAPE and LI, indicated favorable conditions for squall line development, based on a Skew-T Log-P diagram, shows CAPE values reaching 427 J/kg, minimal CIN, and increasing wind shear with altitude. Rainfall distribution analysis identified localized extreme precipitation exceeding 120 mm within the study period, which aligns with the squall line's trajectory. The findings highlight the significant role of squall lines in triggering heavy rainfall and hydrometeorological disasters in Indonesia, emphasizing the need for accurate monitoring and early warning systems.The findings highlight the critical role of mesoscale dynamics in triggering squall lines and their potential to induce hydrometeorological disasters. This study underscores the need for improved monitoring and forecasting of MCS events to mitigate their impacts on vulnerable regions like Semarang.
Analisis Kondisi Atmosfer Saat Kejadian Hujan Es di Sidoarjo 4 November 2024: Analysis of Atmospheric Conditions During the Hailstorm Event in Sidoarjo on 4 November 2024 An-Nizami, Muhammad Subhan; Alghazali, Muhammad Fathurrachman; Haryanto, Yosafat Donni
Jurnal Kolaboratif Sains Vol. 8 No. 9: September 2025
Publisher : Universitas Muhammadiyah Palu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56338/jks.v8i9.8107

Abstract

Penelitian ini menganalisis kejadian hujan es di Kabupaten Sidoarjo pada 4 November 2024 dengan pendekatan komprehensif, meliputi anomali suhu muka laut (SST), profil vertikal udara, parameter ketidakstabilan atmosfer, dan fase pertumbuhan awan. Data yang digunakan mencakup pengamatan lokal, data sounding atmosfer, dan data suhu muka laut dari NOAA. Hasil penelitian menunjukkan bahwa anomali suhu muka laut positif mendukung peningkatan energi laten di atmosfer, yang memicu pertumbuhan awan cumulonimbus. Profil vertikal menunjukkan divergensi di lapisan atas yang mendukung ventilasi awan, serta kelembapan tinggi di lapisan bawah hingga tengah. Ketidakstabilan atmosfer tertinggi terjadi pada fase matang, dengan nilai Lifted Index -3,0 dan CAPE 911 J/kg, menandakan atmosfer sangat mendukung aktivitas konvektif intensif. Studi fase pertumbuhan awan mengonfirmasi intensitas maksimum awan cumulonimbus terjadi pada pukul 07.50 UTC.
Co-Authors An-Nizami, Muhammad Subhan Aries Kristianto Cahya, Shintia Dwi Halawa, Reinal Taruna Wahyu Haryanto, Yosafat Donni Saifulloh, Naufaldi