The rose diagram shows only the swells directed at The Dump that coincided with light winds or offshore conditions through a typical February and is based upon 1584 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours illustrate increasing wave sizes. Blue shows the smallest swells, less that 0.5m (1.5 feet) high. Green and yellow illustrate increasing swell sizes and red represents the biggest swells, greater than >3m (>10ft). In both graphs, the area of any colour is proportional to how commonly that size swell occurs.
The diagram implies that the prevailing swell direction, shown by the biggest spokes, was WSW, whereas the the prevailing wind blows from the SSE. 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 60% of the time, equivalent to 17 days. Expect open water swells to exceed >3m (>10ft) 12% of the time (3 days). Taking into account the fraction of these swells that coincided with predicted offshore winds we estimate that clean surf can be found at The Dump about 60% of the time and that surf is blown out by onshore wind 36% of the time. This is means that we expect 27 days with waves in a typical February, of which 17 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.