The rose diagram shows only the swells directed at Manasquan Inlet that coincided with light winds or offshore conditions through a typical June and is based upon 1600 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours represent increasing wave sizes. Very small swells of less than 0.5m (1.5 feet) high are shown in blue. Green and yellow illustrate increasing swell sizes and biggest swells greater than >3m (>10ft) are shown in red. In both graphs, the area of any colour is proportional to how often that size swell occurs.

The diagram indicates that the most common swell direction, shown by the longest spokes, was SSE, whereas the the prevailing wind blows from the SW. The chart at the bottom shows the same thing but without direction information. For example, swells larger than 1.5 feet (0.5m) coincided with good wind conditions 40% of the time, equivalent to 12 days. Open sea swells exceeding >3m (>10ft) are unlikely to happen in a normal June. Taking into account the proportion of these swells that coincided with expected offshore winds, and given the fact that Manasquan Inlet is exposed to open water swells, we estimate that clean surf can be found at Manasquan Inlet about 40% of the time and that surf is messed up by onshore wind 34% of the time. This is means that we expect 22 days with waves in a typical June, of which 12 days should be surfable.

IMPORTANT: Beta version feature! Swell heights are open water values from NWW3. There is no attempt to model near-shore effects. Coastal wave heights will generally be less, especially if the break does not have unobstructed exposure to the open ocean.