According to the U.S. Geological Survey, the current drought in the West of North America is the worst that has occured in the last 500 years, with water flow levels at close to half those of the drought in the dirty thirties of the previous century. |
North American droughts are linked to the global climate system, linked to both oscillations in the Pacific and the Atlantic Oceans. When the Atlantic Ocean is cooler this typically corresponds to wetter conditions in the American west, while a warmer Atlantic corresponds to drought and decreased water flow in the West.
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