The rose diagram shows only the swells directed at Navarro Rivermouth that coincided with light winds or offshore conditions through a typical August. It is based on 1736 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 largest swells greater than >3m (>10ft) are shown in red. In either graph, the area of any colour is proportional to how commonly that size swell was forecast.

The diagram implies that the most common swell direction, shown by the biggest spokes, was NW (which was the same as the most common wind direction). 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 4% of the time, equivalent to 1 days. Open sea swells exceeding >3m (>10ft) are unlikely to occur in a normal August. Taking into account the proportion of these swells that coincided with expected offshore winds, and given the fact that Navarro Rivermouth is slightly protected from open water swells, we calculate that clean surf can be found at Navarro Rivermouth about 4% of the time and that surf is messed up by onshore wind 63% of the time. This is means that we expect 21 days with waves in a typical August, of which 1 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.