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Famine early warning systems are fundamental for anticipating and preventing food security crises. These systems require diverse socio-economic, climate and other environmental indicators. However, the uncertainty that is inherent in climate forecasts and other early warning data can influence the accuracy of early warning systems. Inaccurate forecasts result in ineffective preparedness and poor resource allocation. We present a replicable method to evaluate the accuracy of the Famine Early Warning System Network (FEWS NET) food security projections. The analysis was carried out for Ethiopia over the period January 2011 to June 2017. The findings show high levels of accuracy in the system overall which should give decision makers a high degree of confidence in using the information provided by FEWS NET. The results indicate higher accuracy in the western parts of the country and lower …