Statistiques de Houle pour Aberwystwyth Beach, Juillet: Vagues avec Vents Légers ou Favorables.
This image shows only the swells directed at Aberwystwyth Beach that coincided with light winds or offshore conditions over a normal July. It is based on 2479 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours show increasing wave sizes. The smallest swells, less than 0.5m (1.5 feet), high are coloured blue. Green and yellow illustrate increasing swell sizes and red illustrates the largest swells, greater than >3m (>10ft). In both graphs, the area of any colour is proportional to how often that size swell occurs.
The diagram indicates that the prevailing swell direction, shown by the biggest spokes, was SW (which was the same as the most common 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 0.2% of the time, equivalent to 0 days. Open sea swells exceeding >3m (>10ft) are unlikely to happen in a normal July. Taking into account the ratio of these swells that coincided with forecast offshore winds, and given the fact that Aberwystwyth Beach is slightly protected from open water swells, we estimate that clean surf can be found at Aberwystwyth Beach about 0.2% of the time and that surf is blown out by onshore wind 11% of the time. This is means that we expect 3 days with waves in a typical July, of which 0 days should be clean enough to surf.
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.