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2009 West Africa floods
The 2009 West Africa floods are a natural disaster that began in June 2009 as a consequence of exceptionally heavy seasonal rainfall in large areas of West Africa.
Several rivers, including the Pendjari, Niger, Volta and Senegal rivers, broke their banks, causing destruction of houses, bridges, roads and crops.〔 The floods are reported to have affected 940,000 people〔 across 12 countries, including Burkina Faso, Benin, Ghana, Niger, Senegal, Guinea, and caused the deaths of at least 193 people.〔〔 In Burkina Faso, one of the most affected countries, 150,000 people fled their homes, mostly in the capital Ouagadougou where rainfall in one day was equal to 25% of normal annual rainfall for the whole country.〔
==Seasonal rainfall==
Countries in West Africa and the southern Sahel get most of their annual rainfall during the boreal summer months from June to September. This rainy season, also known as the West African monsoon, is associated with a seasonal reversal of prevailing winds in the lower atmosphere, where moist air is blown in from the Atlantic Ocean and released over the continent.〔
The exceptionally heavy rainfall experienced in West Africa during the 2009 monsoon season is associated with the periodic warming of the Pacific Ocean, a phenomenon known as El Niño, which affects weather worldwide.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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