Identification of atmospheric dynamic condition during heavy rainfall in Banjarnegara Indonesia using WRF-ARW model: Case 18 June 2016

Abstract

The Atmospheric dynamic condition during heavy rainfall on 18 June 2016 in Banjarnegara was examined using the Weather Research and Forecasting (WRF) model. This study calculated hourly atmospheric instability indices and three kind of atmospheric dynamic parameters such as vorticity, vertical velocity, and divergence. Vorticity described cyclonic movements for the cloud growth, vertical velocity described the speed of lift force, and divergence described the existence of air mass encounter in the atmosphere. The final (FNL) data and suitable schemes are applied for the nested domains (27 km, 9 km, 3 km) in model. The result ofinstabilityindices is the convection was occured 1 hour before heavy rain. The result of vorticity is -0.25 × 10-3/s; 0.9 m/s in vertical velocity; and -0.5 × 10-3/s in divergence. From the study, it was also found that the process of cloud development has been seen for 30 minutes to 1 hour before the heavy rain.