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However, at that time the lack of basin-scale observations made it virtually impossible to link the observations to equatorial wave theory.
The appearance of an equatorial wave, the Inter Tropical Convergence Zone in its most active form, from late December through to this week, situated between 15 and 20oS, ensured a consistent moist air presence close to our northern regions.
The "delayed oscillator" mechanism emphasizes eastward-propagating equatorial wave processes,(*) westward-propagating off-equatorial signals, and their asymmetric reflections at eastern and western boundaries respectively.
An equatorial wave drifts along the northern border while a cold front sweeps across far south of the Cape.
The equatorial wave weakens though as it drifts further west, but advected moist air penetrates into central Namibia.
Meanwhile a further Equatorial wave develops in a similar time range.
A new equatorial wave is expected to form above southern and central Angola.
Loesh, "Nonlinear interactions among equatorial waves," Journal of the Atmospheric Sciences, vol.