Statistiques de Houle pour The Pass, Printemps: Vagues avec Vents LĂ©gers ou Favorables.
This image shows only the swells directed at The Pass that coincided with light winds or offshore conditions over a normal northern hemisphere spring. It is based on 8045 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 show increasing swell sizes and red illustrates biggest swells greater than >3m (>10ft). In both graphs, the area of any colour is proportional to how often that size swell happens.
The diagram indicates that the prevailing 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 arise in a normal northern hemisphere spring. Taking into account the fraction of these swells that coincided with forecast offshore winds, and given the fact that The Pass is slightly protected from open water swells, we calculate that clean surf can be found at The Pass about 0.4% of the time and that surf is messed up 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 clean enough to surf.
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.