Africa is characterised by extremes of climate both spatially and temporally. Unlike in the temperate zones where growing seasons primarily reflect changes in temperature, Africa's rhythms of life reflect rainfall as the "limiting" factor. Generally, Africa has a wide variety of bimodal climates based around a summer wet season and a winter dry season. In fact, Africa's swings between dry and wet seasons are the most pronounced of any of the continents. Not surprisingly therefore, floods and droughts are a common feature all over the continent. Due to the high drought vulnerability in most countries in Africa, it is not surprising that the drought hazards easily develop into disasters with serious consequences. The situation seems to be more serious in the Great Horn of Africa (GHA).