oceanic and atmospherical phenomenom in Pacific ocean. happens every 3-4 years.
Normal year- Western Pacific has warm waters, low pressure heavy rainfall. SE Asia and NE Australia.
Eastern Pacific has cold waters, high pressure, arid conditions in SW America.
El nino year- trade winds get weaker so change direction (W-E)-
Eastern Pacific warm, wet low pressure renching rain S America.
West Pacific cold, dry high pressure droughts in SE Asia and Southern Africa
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