A type of swell with a swell period of less than 11 seconds between successive waves. As a rule, the harder the wind blows, and the longer it blows over a longer distance of ocean, the bigger the swell will be and the longer the swell period will be between successive waves. The longer the swell period, the deeper the swell energy extends below the ocean surface, which interacts more with the ocean floor, or the "ground" so to speak. Wind swells are typically "shallow water" swells because they are always generated by local winds with brief duration and over a limited distance of ocean. Wind swell energy doesn't extend very deep below the ocean surface due to the shorter swell period. As such wind swells wrap (refract) very little into spots compared to ground swells which have longer swell periods and can wrap greatly into spots.