Vaucottes Swell Statistics, January: Surf with Light or Offshore Winds
The rose diagram shows only the swells directed at Vaucottes that coincided with light winds or offshore conditions over a normal January and is based upon 1727 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours illustrate increasing wave sizes. Blue shows the smallest swells, less that 0.5m (1.5 feet) high. Green and yellow show 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 happens.
The diagram indicates that the most common swell direction, shown by the biggest 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 10% of the time, equivalent to 3 days. Open sea swells exceeding >3m (>10ft) are unlikely to arise in a normal January. Taking into account the ratio of these swells that coincided with expected offshore winds, and given the fact that Vaucottes is exposed to open water swells, we calculate that clean surf can be found at Vaucottes about 10% of the time and that surf is messed up by onshore wind 56% of the time. This is means that we expect 20 days with waves in a typical January, 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.