Investigation of the regeneration of precipitating convective cloud in basin topography area

Abstract

The occurrence of precipitation in basin topography area at Bandung can be generated from repeatedly formed convective clouds in one diurnal cycle, which also is detected as multiple rain peaks during a day. In satellite observations, the formation of a new convective cell after dissipation stage of the predecessor cell around or in the same location indicates a regeneration process. The daily convective activities were analyzed during February-May 2017 to understand the regeneration of precipitating convective clouds in Bandung area. The rainfall events were obtained from cumulative distribution function (CDF) at the highest percentages of daily precipitation. This study proposed regeneration index (RegI) as initial identification for convective cloud regeneration from daily rainfall data with multiple peaks. The cases that obtained through the RegI were then verified by satellite data. Both cases at 27 February and 1 May 2017 show that the regeneration of convective cloud was detected in the study area. The precipitating convective clouds initiate in the north Bandung while regenerate and propagate southward. These cases suggest that the highest percentages of daily rainfall in basin topography area can be generated by multiple convective clouds.