This image shows only the swells directed at Antigues Cape that coincided with light winds or offshore conditions through a typical northern hemisphere summer. It is based on 5066 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 illustrates the largest swells, greater than >3m (>10ft). In each graph, the area of any colour is proportional to how commonly that size swell was forecast.

The diagram implies that the prevailing swell direction, shown by the longest spokes, was ENE, whereas the the most common wind blows from the E. 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 96% of the time, equivalent to 87 days. Open sea swells exceeding >3m (>10ft) are unlikely to occur in a normal northern hemisphere summer but 11% of the time we expect swell in the range 2-3m (6.5-10ft) 11%, equivalent to (10 days). Taking into account the ratio of these swells that coincided with forecast offshore winds we estimate that clean surf can be found at Antigues Cape about 96% of the time and that surf is spoilt by onshore wind 3% of the time. This is means that we expect 90 days with waves in a typical northern hemisphere summer, of which 87 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.