What is the definition of groundswell? Why do surfers prefer long-period waves? Learn why are groundswells are better for surfing. Swells form when the wind, at a certain speed, duration and direction, blows over a distance of water called the fetch. When the first waves form, they begin to travel faster or slower, depending on the ocean and wind conditions. A groundswell, or ground swell, is a long-period group of waves created by a distant storm system over long distances, at least 2,000 miles away from the coast.

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What is a groundswell?

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