Aan Swell Statistics, December: Surf with Light or Offshore Winds
This image shows only the swells directed at Aan that coincided with light winds or offshore conditions through a typical December. It is based on 2457 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 biggest swells greater than >3m (>10ft) are shown in red. In each graph, the area of any colour is proportional to how frequently that size swell occurs.
The diagram suggests 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 27% of the time, equivalent to 8 days. Open sea swells exceeding >3m (>10ft) are unlikely to happen in a normal December but 25% of the time you can expect swell in the range 1.3-2m (4-6.5ft) 25%, equivalent to (8 days). Taking into account the ratio of these swells that coincided with predicted offshore winds, and given the fact that Aan is slightly protected from open water swells, we think that that clean surf can be found at Aan about 27% of the time and that surf is messed up by onshore wind 38% of the time. This is means that we expect 20 days with waves in a typical December, of which 8 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.