Algarrobo Swell Statistics, November: Surf with Light or Offshore Winds
This image shows only the swells directed at Algarrobo that coincided with light winds or offshore conditions over a normal November and is based upon 2387 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 represent increasing swell sizes and red represents biggest swells greater than >3m (>10ft). In both graphs, the area of any colour is proportional to how commonly that size swell occurs.
The diagram implies that the dominant swell direction, shown by the longest spokes, was SW, whereas the the prevailing wind blows from the SSW. 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 7% of the time, equivalent to 2 days. Open sea swells exceeding >3m (>10ft) are unlikely to happen in a normal November. Taking into account the proportion of these swells that coincided with forecast offshore winds, and given the fact that Algarrobo is exposed to open water swells, we calculate that clean surf can be found at Algarrobo about 7% of the time and that surf is spoilt by onshore wind 85% of the time. This is means that we expect 28 days with waves in a typical November, of which 2 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.