Atlantic Terrace Swell Statistics, All Year: Surf with Light or Offshore Winds
This image shows only the swells directed at Atlantic Terrace that coincided with light winds or offshore conditions through a typical year and is based upon 28044 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 red shows biggest swells greater than >3m (>10ft). In either graph, the area of any colour is proportional to how commonly that size swell happens.
The diagram implies that the prevailing swell direction, shown by the largest spokes, was SE, whereas the the prevailing wind blows from the W. 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 24% of the time, equivalent to 88 days. Open sea swells exceeding >3m (>10ft) are unlikely to arise in a normal year but 1.1% of the time we expect swell in the range 2-3m (6.5-10ft) 1.1%, equivalent to (4 days). Taking into account the fraction of these swells that coincided with forecast offshore winds, and given the fact that Atlantic Terrace is exposed to open water swells, we think that that clean surf can be found at Atlantic Terrace about 24% of the time and that surf is blown out by onshore wind 40% of the time. This is means that we expect 234 days with waves in a typical year, of which 88 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.