Airport Lefts Swell Statistics, Junho: Surf with Light or Offshore Winds
The rose diagram shows only the swells directed at Airport Lefts that coincided with light winds or offshore conditions over a normal June. It is based on 2306 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 illustrates the highest swells, greater than >3m (>10ft). In both graphs, the area of any colour is proportional to how often that size swell occurs.
The diagram indicates that the most common swell direction, shown by the longest spokes, was SW, whereas the the dominant wind blows from the ESE. 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 96% of the time, equivalent to 29 days. Open sea swells exceeding >3m (>10ft) are unlikely to happen in a normal June but 60% of the time we expect swell in the range 2-3m (6.5-10ft) 60%, equivalent to (18 days). Taking into account the ratio of these swells that coincided with predicted offshore winds, and given the fact that Airport Lefts is exposed to open water swells, we think that that clean surf can be found at Airport Lefts about 96% of the time and that surf is messed up by onshore wind 2.0% of the time. This is means that we expect 29 days with waves in a typical June, of which 29 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.