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La Nina summer effects, illustration. La Nina is the cool phase of the El Nino/La Nina-Southern Oscillation (ENSO) that occurs across the tropical Pacific Ocean roughly every five years. The ENSO affects weather systems across the world, bringing extreme weather such as floods and droughts. The effects vary between summer and winter. This illustration shows summer effects, with areas of dry weather (brown), wet weather (green), cool weather (dark blue), warm weather (red), wet and cool weather (blue), and wet and warm weather (light blue). For the winter effects, see image C026/8987. For the El Nino effects in summer and winter, see images C026/8984 and C026/8985.
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