Anglet - L'Ocean Swell Statistics, Autumn: Surf with Light or Offshore Winds
The rose diagram shows only the swells directed at Anglet - L'Ocean that coincided with light winds or offshore conditions through a typical northern hemisphere autumn. It is based on 7251 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 represent increasing swell sizes and biggest swells greater than >3m (>10ft) are shown in red. In either graph, the area of any colour is proportional to how commonly that size swell happens.
The diagram implies that the most common swell direction, shown by the largest spokes, was WNW, whereas the the prevailing wind blows from the SW. 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 36% of the time, equivalent to 33 days. Open sea swells exceeding >3m (>10ft) are unlikely to arise in a normal northern hemisphere autumn but 5% of the time we expect swell in the range 2-3m (6.5-10ft) 5%, equivalent to (5 days). Taking into account the ratio of these swells that coincided with forecast offshore winds, and given the fact that Anglet - L'Ocean is exposed to open water swells, we estimate that clean surf can be found at Anglet - L'Ocean about 36% of the time and that surf is spoilt by onshore wind 53% of the time. This is means that we expect 81 days with waves in a typical northern hemisphere autumn, of which 33 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.