Anse de Vauville Swell Statistics, Summer: Surf with Light or Offshore Winds
The rose diagram shows only the swells directed at Anse de Vauville that coincided with light winds or offshore conditions through a typical northern hemisphere summer and is based upon 7264 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 each graph, the area of any colour is proportional to how often that size swell was forecast.
The diagram indicates that the prevailing swell direction, shown by the largest spokes, was W (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 3% of the time, equivalent to 3 days. Open sea swells exceeding >3m (>10ft) are unlikely to occur in a normal northern hemisphere summer. Taking into account the ratio of these swells that coincided with expected offshore winds, and given the fact that Anse de Vauville is exposed to open water swells, we estimate that clean surf can be found at Anse de Vauville about 3% of the time and that surf is messed up by onshore wind 30% of the time. This is means that we expect 30 days with waves in a typical northern hemisphere summer, of which 3 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.