Analysis of Initial Z-R Relationship Using Radar Reflectivity Data in Tropical Region

In this paper, we present a technique to estimate the radar reflectivity data and rainfall measurements from rain gauges to predict the radar reflectivity $(Z)$ and rainfall rate $(R)$, $Z-R$ relationship. To investigate the most appropriate $Z-R$ relationship that applicable to Malaysian weather radar, radar reflectivity was analyzed by operating 2.87GHz of Terminal Doppler Weather Radar (TDWR) at Malaysian KLLA radar station and rainfall rate was measured at different points nearby the radar. An observation data in vertical distributions is applied by using pseudo-RHI (range height indicator) and the data processing method is presented in this work. Initial observations between the published $Z-R$ relationship using radar data and rain gange measurements are also demonstrated in this article. By using inappropriate relationship can lead to inaccuracies in estimating radar rainfall values.