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Purchase Knob Great Smoky Mountains National Park
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Purchase Knob, Great Smoky Mountains National Park

April 27, 2012
Mid-morning peak in light rainfall appears as clouds and fog at Purchase Knob in the Great Smoky Mountains National Park. Light rainfall is the most reliable and most frequent form of rainfall in the region, contributing 50 to 60 percent of the total precipitation over a year. Light rain is no less than the lifeline of freshwater resources for the landscape’s ecosystems.

Credit: NASA/Barros


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