Agate and Pearl Street Swell Statistics, All Year: Surf with Light or Offshore Winds
This image shows only the swells directed at Agate and Pearl Street 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 illustrate increasing swell sizes and red represents highest swells greater than >3m (>10ft). In both graphs, the area of any colour is proportional to how commonly that size swell happens.
The diagram implies that the dominant swell direction, shown by the biggest spokes, was WSW (which was the same as the dominant 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 19% of the time, equivalent to 69 days. Open sea swells exceeding >3m (>10ft) are unlikely to arise in a normal year but 2% of the time you can expect swell in the range 1.3-2m (4-6.5ft) 2%, equivalent to (7 days). Taking into account the ratio of these swells that coincided with forecast offshore winds, and given the fact that Agate and Pearl Street is exposed to open water swells, we calculate that clean surf can be found at Agate and Pearl Street about 19% of the time and that surf is blown out by onshore wind 14% of the time. This is means that we expect 120 days with waves in a typical year, of which 69 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.