Why do El Nio and La Nia occur?
El Nio and La Nia are naturally occurring phenomena that result from interactions between the ocean surface and the atmosphere over the tropical Pacific. Changes in the ocean surface temperatures affect tropical rainfall patterns and atmospheric winds over the Pacific ocean, which in turn impact the ocean temperatures and currents. The El Nino and La Nia related patterns of tropical rainfall cause changes in the weather patterns around the globe. Show me the tropical rainfall patterns for a strong El Nio and La Nina. Show me areas typically affected by El Nio and La Nina.
