The Pass Golf Statistieken, Lente: Golven met Licht of Offshore Winden
This image shows only the swells directed at The Pass that coincided with light winds or offshore conditions over a normal northern hemisphere spring and is based upon 6573 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 red represents the biggest swells, greater than >3m (>10ft). In each graph, the area of any colour is proportional to how commonly that size swell occurs.
The diagram implies that the most common swell direction, shown by the largest spokes, was SE, whereas the the prevailing 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 0.4% of the time, equivalent to 0 days. Open sea swells exceeding >3m (>10ft) are unlikely to happen in a normal northern hemisphere spring. Taking into account the ratio of these swells that coincided with forecast offshore winds, and given the fact that The Pass is slightly protected from open water swells, we think that that clean surf can be found at The Pass about 0.4% of the time and that surf is blown out by onshore wind 3% of the time. This is means that we expect 3 days with waves in a typical northern hemisphere spring, of which 0 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.