El Nino (Spanish for “the boy”) and La Nina (Spanish for “the girl”) are both part of the El Nino Southern Oscillation. This is a periodic change in the ocean and atmospheric conditions in the central and eastern parts of the Pacific Ocean. This is caused when the ocean surface water temperature fluctuates. This oscillation occurs every 3 to 8 years, with no known explanation of cause to date. El Nino refers to the warm phase of this oscillation, and La Nina refers to the cold phase. When El Nino occurs (as it is commonly referred too), there are usually large changes in water, ranging from severe thunderstorms to warmer seasons.
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