Arpoador Golf Statistieken, Hele Jaar: Golven met Licht of Offshore Winden
This image shows only the swells directed at Arpoador that coincided with light winds or offshore conditions over a normal 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 illustrate increasing wave sizes. Blue shows the smallest swells, less that 0.5m (1.5 feet) high. Green and yellow represent increasing swell sizes and red shows highest swells greater than >3m (>10ft). In each graph, the area of any colour is proportional to how commonly that size swell was forecast.
The diagram implies that the prevailing swell direction, shown by the biggest spokes, was SE, whereas the the dominant wind blows from the ENE. 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 25% of the time, equivalent to 91 days. Open sea swells exceeding >3m (>10ft) are unlikely to occur in a normal year but 5% of the time we expect swell in the range 2-3m (6.5-10ft) 5%, equivalent to (18 days). Taking into account the ratio of these swells that coincided with predicted offshore winds, and given the fact that Arpoador is slightly protected from open water swells, we estimate that clean surf can be found at Arpoador about 25% of the time and that surf is messed up by onshore wind 17% of the time. This is means that we expect 153 days with waves in a typical year, of which 91 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.