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Related to Convergence zone: Intertropical Convergence Zone
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Inter-Tropical Convergence Zone causing widespread rains across several hundred kilometres in the belt south of the Angola border.
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.
It might be early to identify this as being the southern presence of the Inter-Tropical Convergence Zone, but it is confirmed by similar developments in the rest of the southern hemisphere.
For seven of the past nine summers, this has created space for the Inter-Tropical Convergence Zone, where moist air rules, to wander further south, bringing above normal precipitation to Namibia.
While marking Congo air it also designates the outline of the Inter-Tropical Convergence Zone.
The overall evidence is that the La Nina has collapsed, despite the Pacific Ocean convergence zone indicating a negative oscillation.
The Met Office's Dave Clark said: "The winds are so light that it creates convergence zones, where the wind comes from several directions to one spot.