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"ABSTRACTThe tropical atmospheric phenomenon known as the Madden Julian Oscillation (MJO) is an atmospheric, large scale, eastward propagating circulation anomaly that originates over the Western Indian Ocean, confined to the tropics, and moves at around 5 to 10 ms with return interval from 30 to 60 days. Near global analysis demonstrated that the MJO is a signficant phenomenon that can influence daily rainfall patterns, even at higher latitudes, through interactions with Mean Sea Level Pressure (MSLP). Areas where the MJO phenomenon occur; can be used to gather information on the weather and climate in order to forecasting MJO phenomenon. MJO is responsible for intraseasonal climate variance not only in the tropics, but also in higher latitudes."

"Pertumbuhan awan konvektif erat kaitannya dengan kejadian hujan disertai petir, dapat berpotensi menimbulkan bencana hidrometeorologi. Posisi geografis dan kondisi topografi yang bervariasi dapat memengaruhi pertumbuhan awan konvektif penghasil hujan di suatu wilayah. Penelitian ini akan mengkaji bagaimana pola sebaran dan karakteristik dari pertumbuhan awan konvektif di wilayah Provinsi Banten dengan menggunakan data radar cuaca dan reanalysis. Metode analisis deskriptif dan analisis spasial terhadap wilayah penelitian di Provinsi Banten digunakan untuk menganalisis kajian spasial awan konvektif. Hasil penelitian menunjukkan pola sebaran awan konvektif yang lebih tinggi pada periode siang hari di musim hujan. Karakteristik awan konvektif di Provinsi Banten memperlihatkan bahwa awan sel tunggal memiliki masa hidup yang lebih pendek dibandingkan multi sel. Pergerakan sel tunggal didominasi oleh pergerakan stasioner, sedangkan pada multi sel didominasi oleh pergerakan dengan orientasi dari arah Utara-Timur Laut dan Barat Daya-Barat. Fase matang menjadi fase yang paling singkat dimana presipitasi dominan terjadi pada fase tersebut. Faktor cuaca yang memengaruhi pertumbuhan awan konvektif di Provinsi Banten yaitu skala regional berupa aktivasi Madden-Julian Oscilation (MJO), cold surge, daerah belokan/pertemuan angin, faktor skala lokal berupa kondisi kelembapan udara, dan indeks stabilitas parameter K-Index. Indikasi adanya pemampatan laju aliran sungai menjadi salah satu penyebab yang memicu terjadinya bencana banjir di lokasi penelitian yang seluruhnya berada di dekat aliran sungai.

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Development of convective cloud is closely related to rain and lightning events. It may cause hydro-meteorological disasters. The geographical position and varied topography can affect the formation of convective clouds producing precipitation in the region. This research will examine how the distribution patterns and characteristics of convective cloud development in Banten using weather radar and reanalysis data. Descriptive analysis and spatial analysis methods were used to analyze convective clouds spatial study of the research area in Banten Province. The results showed that the distribution pattern of convective clouds higher during the daytime in the rainy season. Characteristics of convective clouds in Banten province show that a single cell cloud has a life span shorter than a multi-cell. Single-cell movement is dominated by stationary movement, while the North-Northeast and Southwest-West orientation dominate the multi-cell movement. The mature phase becomes the shortest phase, where the dominant precipitation occurs in that phase. The weather factors that affect the development of convective clouds in Banten are regional scales in the form of Madden-Julian Oscillation (MJO) activation, cold surges, and wind shear/convergence, local-scale factors in the form of relative humidity conditions, and the stability index of the K-Index parameter. Indications of a compressed river flow rate are among the causes that triggered flooding in all the case studies near river flows."