Aberavon Golf Statistieken, June: Golven met Licht of Offshore Winden
The rose diagram shows only the swells directed at Aberavon that coincided with light winds or offshore conditions over a normal June. It is based on 2305 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 show increasing swell sizes and red shows the highest swells, greater than >3m (>10ft). In both graphs, the area of any colour is proportional to how frequently that size swell happens.
The diagram suggests that the dominant swell direction, shown by the largest spokes, was WSW (which was the same as the dominant wind direction). 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 12% of the time, equivalent to 4 days. Open sea swells exceeding >3m (>10ft) are unlikely to arise in a normal June. Taking into account the fraction of these swells that coincided with predicted offshore winds, and given the fact that Aberavon is exposed to open water swells, we estimate that clean surf can be found at Aberavon about 12% of the time and that surf is blown out by onshore wind 52% of the time. This is means that we expect 19 days with waves in a typical June, of which 4 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.