Aberarth Swell Statistics, June: Surf with Light or Offshore Winds
This image shows only the swells directed at Aberarth that coincided with light winds or offshore conditions over a normal June. It is based on 2303 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 illustrates the biggest swells, greater than >3m (>10ft). In either graph, the area of any colour is proportional to how commonly that size swell happens.
The diagram implies that the prevailing swell direction, shown by the largest spokes, was SW, whereas the the prevailing wind blows from the W. 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 4% of the time, equivalent to 1 days. Open sea swells exceeding >3m (>10ft) are unlikely to arise in a normal June. Taking into account the proportion of these swells that coincided with expected offshore winds, and given the fact that Aberarth is slightly protected from open water swells, we estimate that clean surf can be found at Aberarth about 4% of the time and that surf is spoilt by onshore wind 7% of the time. This is means that we expect 3 days with waves in a typical June, of which 1 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.