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Moderate and Intense Rainfall Rates and Total Rain Accumulation over the Northern and Southern Nigeria

JS Ojo
A Oluleye
OL Ojo


This paper is concerned with the statistical investigation of rainfall intensities for 30-years (1975-2004) over Southern and Northern Nigeria. The average rainfall intensity was analyzed to study the diurnal, monthly, and annual variation of total rain accumulation. The study has shown that the northern part of Nigeria (Kano) with the lowest amount of average precipitation recorded the highest percentage of convective rainfall of ~76.7% while 23.3% were for stratiform in terms of the total duration and intensity of the rain events. The southern part (Calabar) recorded the highest number of rain events of about 186 with percentage of convective rainfall of about 67.3% and 32.7% stratiform. The southern oscillation values were low in 1975, 1981, 1984, 1989, 1996 and 1999. The variations in the rainfall fields are due to the dynamic nature of the inter-tropical convergence zone (ITCZ). These results are vital for hydrological processes and radio propagation.

Keywords: Rainfall intensities, ITCZ, ENSO, hydrological processes and radio propagation.

Journal Identifiers

print ISSN: 2006-7003