Anna Maria Key Swell Statistics, All Year: Surf with Light or Offshore Winds
This image shows only the swells directed at Anna Maria Key that coincided with light winds or offshore conditions through a typical year and is based upon 28003 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 represent 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 frequently that size swell occurs.
The diagram suggests that the prevailing swell direction, shown by the largest spokes, was NW, whereas the the most common wind blows from the ENE. 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 6% of the time, equivalent to 22 days. Open sea swells exceeding >3m (>10ft) are unlikely to happen in a normal year. Taking into account the fraction of these swells that coincided with expected offshore winds, and given the fact that Anna Maria Key is exposed to open water swells, we estimate that clean surf can be found at Anna Maria Key about 6% of the time and that surf is spoilt by onshore wind 14% of the time. This is means that we expect 73 days with waves in a typical year, of which 22 days should be clean enough to surf.
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.