Preliminary Investigation of Generation of Guerilla-Heavy Rainfall Using Himawari-8 and XRAIN Information in Kinki Region

Abstract

The preliminary study of utilization of Himawari-8 observation data and XRAIN data to investigate the generation of Guerilla-heavy rainfall (GHR) in Kinki region will be described in this paper. The image of cloud captured by Himawari-8 observation appear displaced because of the parallax effect in its observation. 16 pairs of brightness temperature (BT; band13) of Himawari-8 observational data overlaid with radar observational data to retrieve the linear equation to solve parallax effect. The linear equation finally will relocate the displaced of cloud image to the original location. The correctness of relocated cloud will be confirmed by comparing the estimated cloud top height and precipitation top height. The movement vector of BT was applied to solve parallax effect for band 03 visible channel. The RDCA index which developed by calculation of some observation bands data of Himawari-8 is used to predict the occurrence of radar echo aloft which can cause GHR. The RDCA identification location then next is corrected by movement vector of BT in parallax correction of visible band (03). By some cases which have been analyzed we propose the using of RDCA to predict the occurrence of GHR.