Statistiques de Houle pour Aberystwyth harbour trap, Été: Vagues avec Vents Légers ou Favorables.
This image shows only the swells directed at Aberystwyth harbour trap that coincided with light winds or offshore conditions over a normal northern hemisphere summer. It is based on 7261 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 represents biggest swells greater than >3m (>10ft). In each graph, the area of any colour is proportional to how frequently that size swell occurs.
The diagram suggests that the dominant swell direction, shown by the largest spokes, was SW (which was the same as the prevailing 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 0.8% of the time, equivalent to 1 days. Open sea swells exceeding >3m (>10ft) are unlikely to happen in a normal northern hemisphere summer. Taking into account the proportion of these swells that coincided with predicted offshore winds, and given the fact that Aberystwyth harbour trap is slightly protected from open water swells, we estimate that clean surf can be found at Aberystwyth harbour trap about 0.8% of the time and that surf is spoilt by onshore wind 11% of the time. This is means that we expect 11 days with waves in a typical northern hemisphere summer, 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.