Augusta Rivermouth Swell Statistics, Winter: Surf with Light or Offshore Winds
This image shows only the swells directed at Augusta Rivermouth that coincided with light winds or offshore conditions through a typical southern hemisphere winter. It is based on 7266 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours show increasing wave sizes. The smallest swells, less than 0.5m (1.5 feet), high are coloured blue. Green and yellow show increasing swell sizes and highest swells greater than >3m (>10ft) are shown in red. In both graphs, the area of any colour is proportional to how often that size swell happens.
The diagram indicates that the most common swell direction, shown by the longest spokes, was SSW, whereas the the dominant wind blows from the WNW. 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 8% of the time, equivalent to 7 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 predicted offshore winds, and given the fact that Augusta Rivermouth is slightly protected from open water swells, we think that that clean surf can be found at Augusta Rivermouth about 8% of the time and that surf is messed up by onshore wind 16% of the time. This is means that we expect 22 days with waves in a typical southern hemisphere winter, of which 7 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.