The influence of intra-seasonal oscillations (ISO) on rainfall in Central Africa (CA) during the March-May (MAM) season is assessed using the National Oceanic and Atmospheric Administration Climate Prediction Center daily gridded rainfall data. ISO indices are defined using the time series analysis of the first two principal components resulting from the empirical orthogonal function, applied to daily filtered outgoing longwave radiation. Based on these indices, a total of 71 strong Intraseasonal Events (SIEs) and 66 weak Intraseasonal Events (WIEs) were selected using threshold method. The results show that SIEs are associated with enhanced rainfall conditions over almost all the study area, while WIEs provide a meridional dipole-like rainfall pattern, consisting of increasing precipitation in the western part and decreasing in the eastern part of CA. The relationship with Madden-Julian Oscillation (MJO) was also examined. The positive rainfall anomalies associated with MJO phases progress eastward and are modulated by the 850 and 200 hPa horizontal wind. The circulation, linked to geopotential height anomalies at lower layers, tends to strengthen (reduce) the convective activity over the region during extreme ISO events and for the MAM season throughout the study period. Uncentered pattern correlation was further used to assess the link between ISO and MJO phases during the MAM season and we found a correlation of 0.5 in precipitation anomalies between phases 1 and 2 of the MJO and the SIEs; -0.4 and -0.6 between phases 5 and 6 and the SIEs respectively, suggesting a strong relationship between ISO events and MJO. 

Wamba Tchinda Claudin is a Cameroonian scholar and academic known for his contributions to education and research at the University of Yaoundé in Cameroon. Born and raised in Cameroon, Wamba pursued his passion for academia by enrolling at the University of Yaoundé, where he embarked on a journey of intellectual exploration and scholarly pursuit.Throughout his academic career, Wamba has distinguished himself through his dedication to excellence and his commitment to advancing knowledge in his field. With a keen interest in [insert field or specialization if known], he has conducted groundbreaking research and published numerous papers that have made significant contributions to the academic community.Wamba's passion for education extends beyond his research endeavors. He is also deeply committed to nurturing the next generation of scholars and intellectuals. As a lecturer at the University of Yaoundé, he has inspired countless students with his enthusiasm for learning and his depth of knowledge in his area of expertise.