This image shows only the swells directed at Kakapo that coincided with light winds or offshore conditions through a typical December. It is based on 1736 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours represent increasing wave sizes. Very small swells of less than 0.5m (1.5 feet) high are shown in blue. Green and yellow illustrate increasing swell sizes and red illustrates the highest swells, greater than >3m (>10ft). In either graph, the area of any colour is proportional to how often that size swell was forecast.
The diagram indicates that the most common swell direction, shown by the biggest spokes, was SW, whereas the the dominant wind blows from the S. 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 52% of the time, equivalent to 16 days. Open water swells exceeding >3m (>10ft) only occur 4% of the time in a typical December, equivalent to just one day but 40% of the time we expect swell in the range 2-3m (6.5-10ft) 40%, equivalent to (12 days). Taking into account the fraction of these swells that coincided with forecast offshore winds, and given the fact that Kakapo is slightly protected from open water swells, we estimate that clean surf can be found at Kakapo about 52% of the time and that surf is blown out by onshore wind 33% of the time. This is means that we expect 26 days with waves in a typical December, of which 16 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.