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All Journal JOURNAL ONLINE OF PHYSICS Newton-Maxwell Journal of Physics
Oktabrian, Krisna Dwi
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Astronomy Earth & Planetary Sciences Electrical & Electronics Engineering Mechanical Engineering Physics

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Identifikasi Kondisi Atmosfer Kejadian Hujan Lebat Jakarta Selatan Berbasis Data Observasi, Satelit, dan Model ERA-5 (Studi Kasus 11 November 2024) Oktabrian, Krisna Dwi; Darmawan, Yahya; Rahma, Nuzula Elfa; Franchitika, Rizky
Newton-Maxwell Journal of Physics Vol. 6 No. 2: Oktober 2025
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/nmj.v6i2.40942

Abstract

On November 11, 2024, a heavy rainfall event with a recorded precipitation of 94.6 mm occurred in South Jakarta, leading to flooding in the area. This study aims to analyze the atmospheric factors that contributed to the event and emphasize the importance of integrating satellite data, numerical models, and observational data in understanding extreme weather phenomena. The data used in this study include ERA-5 reanalysis data from ECMWF, satellite imagery from Himawari-9, and observations from automatic rain gauges (ARG). The analysis results indicate that the heavy rainfall was influenced by several key factors, including significant moisture transport from the Indian Ocean, strong low-level convergence, and unstable atmospheric conditions. The convective available potential energy (CAPE) value approached 900 J/kg, and the relative humidity reached 90%, both supporting the development of deep convective clouds. These findings highlight the importance of integrating data from various sources in diagnosing and understanding the mechanisms behind extreme rainfall events in tropical urban regions.
EVALUASI PENGARUH ASIMILASI DATA SATELIT TERHADAP SIMULASI HUJAN ES MENGGUNAKAN WRF-HAILCAST (STUDI KASUS HUJAN ES YOGYAKARTA, 11 MARET 2025) Oktabrian, Krisna Dwi; Mulsandi, Adi; Fadlan, Ahmad; Mulya, Aditya
JOURNAL ONLINE OF PHYSICS Vol. 11 No. 3 (2026): JOP (Journal Online of Physics) Vol 11 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v11i3.58583

Abstract

Hujan es merupakan fenomena cuaca ekstrem yang dipengaruhi oleh proses konvektif dan mikrofisika awan yang kompleks. Penelitian ini bertujuan mengevaluasi pengaruh asimilasi data satelit menggunakan WRF-DA 3DVAR terhadap simulasi hujan es dengan WRF-HAILCAST pada kejadian hujan es Yogyakarta tanggal 11 Maret 2025. Dua eksperimen dilakukan, yaitu tanpa asimilasi (NODA) dan dengan asimilasi data satelit (DAST). Hasil menunjukkan bahwa asimilasi data satelit meningkatkan pembentukan hidrometeor fase es, ditandai dengan konsentrasi cloud water lebih dari 0,06 g/kg, kristal es lebih dari 0,014 g/kg, dan graupel mencapai 0,175 g/kg. Kedua eksperimen menghasilkan estimasi diameter hujan es 10–30 mm dengan diameter maksimum sekitar 25–30 mm. Meskipun tidak meningkatkan diameter maksimum, DAST mampu merepresentasikan lokasi pembentukan hujan es lebih mendekati distribusi ZHAIL radar. Selain itu, nilai koefisien korelasi reflektivitas meningkat dari 0,48 menjadi 0,56, menunjukkan bahwa asimilasi data satelit meningkatkan representasi struktur badai dan lokasi kejadian hujan es.  
Co-Authors Adi Mulsandi Fadlan, Ahmad Franchitika, Rizky Mulya, Aditya Rahma, Nuzula Elfa Yahya Darmawan