Study of Convective Cloud Lifetime and Movement Using Radar Image and ECMWF Model

Mochammad Donny Anggoro, Bagus Pramujo

Abstract


Clouds as actors in the atmospheric dynamics, it is important to learn especially the convective cloud. Utilization of numerical weather models is expected to interpret weather conditions, particularly to identify lifetime and convective cloud movements with ECMWF Model. Radar data is used to show the characteristic of convective clouds that producing hail and heavy rain with digitization method and life history method. Maximum VIL value of hail case studies in Bogor is 45 kg/m2; maximum reflectivity is 65 dBz reaches a height of 9 km at 08.12 UTC. Three Body Scatter Spike (TBSS) appear as a mark will occur hail process. The growth of convective clouds that producing hail on July 5 2016, in Bogor, occurred for 140 minutes. The cumulus stage takes 33 minutes, the mature stage takes 80 minutes, and the dissipation stage takes 27 minutes. The convective clouds move from southeast-south is caused by regional factors, with speed of 12-18 knots. Relative Humidity (RH) 85-90% is present in layers 840 mbar to 810 mbar. Maximum VIL value of heavy rain case studies is 5 kg/m2, and maximum reflectivity is 58 dBz. The growth of convective clouds that producing heavy rain on February 16 2016 occurred for 220 minutes. The cumulus stage takes 30 minutes, the mature stage takes 150 minutes, and the dissipation stage takes 40 minutes. The convective clouds move from the northwest is caused by regional factors, with speed of 5-10 knots. Relative Humidity (RH) is more than 95% is present in layers 400 mbar to 200 mbar.

Keywords


hail; lifetime; movement; digitization.

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DOI: http://dx.doi.org/10.18517/ijaseit.8.2.4212

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