The rose diagram shows only the swells directed at Fernandina Beach Pier that coincided with light winds or offshore conditions through a typical February. It is based on 1584 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 show increasing swell sizes and biggest 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 was forecast.
The diagram suggests that the most common swell direction, shown by the longest spokes, was ENE, whereas the the prevailing wind blows from the W. 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 10% of the time, equivalent to 3 days. Open sea swells exceeding >3m (>10ft) are unlikely to occur in a normal February. Taking into account the fraction of these swells that coincided with predicted offshore winds, and given the fact that Fernandina Beach Pier is exposed to open water swells, we think that that clean surf can be found at Fernandina Beach Pier about 10% of the time and that surf is spoilt by onshore wind 22% of the time. This is means that we expect 9 days with waves in a typical February, of which 3 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.