Abstract
THE recent drought conditions in the Sahel region of Africa have generated studies of long term trends in rainfall and monthly or seasonal atmospheric conditions related to the area1–5. The results of these studies, in general, indicate no specific trends in precipitation3, and some evidence of direct1 and/or long distance5 relationships between monthly or seasonal atmospheric state and Sahelian rainfall. We present here the results of a study which suggest the major factor affecting rainfall during the drought was a change in easterly wave activity over northern tropical Africa.
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