Study of Mesoscale Convective Complex (MCC) and its impact over the Makassar Strait (case study: 9 December 2014)

Abstract

A mesoscale Convective System (MCS) is a system consisting of groups of convective cells in the mesoscale. One of the largest types of MCS subclass is Mesoscale Convective Complex (MCC) occurred in the eastern part of the Makassar Strait near the Madjene and Polewali Mandar regions on 9 December 2014, morning to evening (09.00-15.00 LT). Using MTSAT-2 Satellite Imagery data, reanalysis of the European Centre for Medium-Range Weather Forecasts (ECMWF) interim era, the Global Satellite Mapping of Precipitation (GsMap) rainfall, sea surface temperature, surface air observation, and upper air observation, the author will examine the existence of MCC in the Makassar Strait in terms of atmospheric conditions when MCC enters the initial until extinct and the accompanying effects of precipitation. In general, it is known that the MCC formed in the waters of the Makassar Strait in the morning, and then it moved westward. The mechanism of its formation was through a process of convergence of the lower layers in the waters of the Makassar Strait and its surroundings to trigger the process of cloud formation. Warm thermal conditions also gave a big influence on the lower layers to the top and activate convective in the study area. Meanwhile, the MCC occurrence region also has high relative humidity, negative divergence values, and maximum vorticity values. The impact of the emergence of MCC on that date resulted in areas with very large humidity and cloud formation and produced rain in the surrounding area, in this case using rainfall data from Hasanuddin Meteorological Station, Makassar, South Sulawesi. With a duration of up to seven hours extinct, MCC in the Makassar Strait produces heavy rainfall in the Makassar Strait waters.

Pemanfaatan Data Pengamatan Pilot Ballon untuk Analisis Kondisi Atmosfer sebelum Terjadinya Hujan Lebat di Wilayah Samarinda (Studi Kasus 2015 – 2022)

“…Pengamatan udara atas tersebut dapat dilakukan dengan menggunakan Radiosonde (Rason) ataupun Pilot Ballon (Pibal) [5] . Berbagai penelitian menunjukkan bahwa data pengamatan udara atas tersebut dapat menggambarkan kondisi atmosfer seperti profil vertikal udara atau gerak udara dan labilitas atmosfer dengan baik [3], [4] . Badan Meteorologi, Klimatologi, dan Geofisika (BMKG) sebagai lembaga pemerintah yang bertanggung jawab dalam bidang meteorologi memiliki berbagai tugas, salah satunya melakukan pengamatan udara atas.…”

“…Hal ini dilakukan karena umumnya pengamatan Pibal jam 00 UTC dapat mencapai ketinggian yang lebih tinggi (lapisan signifikan) dibanding pengamatan pada jam lainnya. Hasil olahan tersebut dapat digunakan untuk mengetahui adanya potensi aktivitas konvektif, pembentukan awan Cumulonimbus dan cuaca buruk [3], [6], [7], [8] .…”