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African Water Development Report 2006 - United Nations Economic ...

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<strong>African</strong> <strong>Water</strong> <strong>Development</strong> <strong>Report</strong> <strong>2006</strong>this type of anomalies. Here, special attentionmust be paid to the work of Nicholson (1986) onspatial coherence of <strong>African</strong> rainfall anomalieswhich needs to be further enhanced in order toevolve some index of anomaly that could be em-ployed as a predictor of possible anomalous rainyseasons based on advance knowledge of rainfallanomalies in other climatic areas of the continent,especially within intra hemispheric regionsof Africa (Andah, 1988).Figure 10.4: Current vs Mean Position of the Africa ITCZ, as analyzed by the NOAAClimate Preditction CenterNote: The migration of the inter-tropical convergence zone (ITCZ) in Africa affects seasonal precipitation patterns across that continent. The blueshading on the map shows the areas of highest cloud reflectivity, which correspond to the average monthly position of the ITCZ.Table 10.1: 2005 10-Day Mean ITCZ Position15W 10W 5W 0 5E 10E 15E 20E 25E 30E 35EApril 1-10 10.2 11.9 12.6 12.7 10.6 7.6 6.9 7.1 7.0 7.8 9.3April 11-20 5.1 8.1 11.8 13.4 12.8 10.9 11.4 10.1 8.5 9.4 11.6April 21-30 9.6 12.1 13.6 14.3 13.9 12.6 12.2 12.1 11.5 11.8 12.4May 1-10 12.7 14.6 16.1 16.7 16.4 15.2 14.3 13.2 12.1 11.4 12.0May 11-20 13.4 14.2 15.0 15.0 13.2 11.3 11.1 11.0 9.9 10.3 12.4May 21-31 10.5 13.3 15.4 17.3 16.4 14.5 13.6 13.5 13.2 14.5 16.2June 1-10 10.7 16.1 17.3 18.1 18.3 17.6 16.1 14.8 13.3 13.5 15.5June 11-20 15.0 17.0 17.8 17.6 18.5 17.5 15.8 13.9 12.9 13.9 15.9June 21-30 16.4 17.1 17.2 17.4 17.0 16.0 15.4 14.1 13.7 14.0 16.5July 1-10 17.0 18.5 19.8 19.7 19.3 18.6 18.4 17.4 16.1 16.9 17.9July 11-20 18.7 20.0 20.9 20.5 18.4 17.1 16.1 16.2 16.6 17.3 18.6July 21-31 17.2 18.3 19.5 19.2 18.0 17.5 17.7 18.0 17.0 17.6 19.5August 1-10 18.7 20.4 20.8 20.1 18.8 18.1 18.1 17.4 17.6 18.8 20.4August 11-20 19.9 20.8 21.1 19.5 18.3 17.5 18.0 18.2 17.8 17.1 18.5Source: NOAA, 2005232

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