What is already known:
What this study adds:
This study evaluates the impact of the Madden-Julian oscillation on the diurnal cycle of tropical rainfall and cloud populations by analyzing data from the TOGA radar aboard R/V Roger Revelle. The data was collected during the DYNAMO field campaign which investigated MJO initiation processes and cloud evolution. Rain rate and rain type data were examined to understand the diurnal cycle observed by the TOGA radar. The mean hourly time series of rainfall during the overall field campaign displayed a strong afternoon maximum in comparison to the climatological diurnal cycle that has been documented by satellite-based rain estimates. The diurnal cycle during the MJO enhanced phase shows a strong afternoon maximum when compared to S-PolKa radar. Large differences were observed in the time series of the diurnal cycles between the two MJO events that occurred during the observed period. This study aims to increase knowledge of the diurnal cycle with respect to the MJO by studying differences seen between the TOGA and S-PolKa radars.