Algarrobo Swell Statistics, Winter: Surf with Light or Offshore Winds
This image shows only the swells directed at Algarrobo that coincided with light winds or offshore conditions through a typical southern hemisphere winter and is based upon 7266 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 highest swells greater than >3m (>10ft) are shown in red. In each graph, the area of any colour is proportional to how frequently that size swell happens.
The diagram suggests that the most common swell direction, shown by the biggest spokes, was WSW, whereas the the dominant 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 22% of the time, equivalent to 20 days. Expect open water swells to exceed >3m (>10ft) 3% of the time (3 days). Taking into account the proportion of these swells that coincided with expected offshore winds, and given the fact that Algarrobo is exposed to open water swells, we think that that clean surf can be found at Algarrobo about 22% of the time and that surf is messed up by onshore wind 77% of the time. This is means that we expect 90 days with waves in a typical southern hemisphere winter, of which 20 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.