Arinaga Swell Statistics, All Year: Surf with Light or Offshore Winds
This image shows only the swells directed at Arinaga that coincided with light winds or offshore conditions through a typical year. It is based on 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 highest swells greater than >3m (>10ft) are shown in red. In either 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 largest spokes, was NNW, whereas the the dominant wind blows from the NNE. 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 1.3% of the time, equivalent to 5 days. Open sea swells exceeding >3m (>10ft) are unlikely to arise in a normal year but 1.2% of the time we expect swell in the range 2-3m (6.5-10ft) 1.2%, equivalent to (4 days). Taking into account the proportion of these swells that coincided with expected offshore winds, and given the fact that Arinaga is quite sheltered from open water swells, we estimate that clean surf can be found at Arinaga about 1.3% of the time and that surf is messed up by onshore wind 14% of the time. This is means that we expect 55 days with waves in a typical year, of which 5 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.