Anglet - Les Dunes Swell Statistics, Winter: Surf with Light or Offshore Winds
This image shows only the swells directed at Anglet - Les Dunes that coincided with light winds or offshore conditions over a normal northern hemisphere winter and is based upon 6931 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 show increasing swell sizes and red represents the largest swells, greater than >3m (>10ft). In both graphs, 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 WNW, whereas the the most common wind blows from the SSW. 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 30% of the time, equivalent to 27 days. Open water swells exceeding >3m (>10ft) only happen 0.8% of the time in a typical northern hemisphere winter, equivalent to just one day but 8% of the time we expect swell in the range 2-3m (6.5-10ft) 8%, equivalent to (7 days). Taking into account the proportion of these swells that coincided with expected offshore winds, and given the fact that Anglet - Les Dunes is exposed to open water swells, we think that that clean surf can be found at Anglet - Les Dunes about 30% of the time and that surf is spoilt by onshore wind 62% of the time. This is means that we expect 84 days with waves in a typical northern hemisphere winter, of which 27 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.