KAJIAN ATMOSFER SAAT MCC (MESOSCALE CONVECTIVE COMPLEX) DI PAPUA BARAT (STUDI KASUS 14 AGUSTUS 2017)
Keywords:
MCC, awan cumulonimbus , fenomena skala mesoAbstract
Mesoscale Convective Complex (MCC) is one type of Mesoscale Convective System (MCS). MCC forms a large storm cloud system from the larger number of single Cumulonimbus cells that converge and grow into a meso-scale convective cloud cluster. On August 14th, 2017 MCC formed in West Papua with a lifetime from 14:00 to 19:00 UTC. The MCC phenomenon produced rain that lasts long enough and continuous. This study aims to assess the condition of the atmosphere during the occurrence of MCC in West Papua on August 14, 2017. This study uses reanalysis data from ECMWF in the form of meridional and zonal wind component, vorticity, and air humidity parameters. In addition, it also needs to be studied by using Himawari 8 satellite imagery and Radiosonde data. From the meridional and zonal wind components at 06.00-24.00 UTC, there is a fairly strong wind in West Papua with the direction of movement from the northwest to north. Based on preliminary study, the coefficient of 500 mb layer vortices at 06.00-24.00 UTC is shown negative which indicates cyclonic circulation in the central troposphere layer. This condition is supported by the value range of air humidity between 70-100% which indicates the layers condition at that time is relatively wet. In Himawari 8 satellite imagery shows a cluster of Cumulonimbus clouds with a peak temperature reached -80 0C and a diameter was about 200 km, which is mixed with other types of clouds. Thus, that MCC is classified as a beta category MCS
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