Annascaul Rivermouth Swell Statistics, February: Surf with Light or Offshore Winds
This image shows only the swells directed at Annascaul Rivermouth that coincided with light winds or offshore conditions over a normal February. It is based on 2102 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 red represents biggest swells greater than >3m (>10ft). In each 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 largest spokes, was W, whereas the the prevailing wind blows from the SW. 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 9% of the time, equivalent to 3 days. Open water swells exceeding >3m (>10ft) only occur 4% of the time in a typical February, equivalent to just one day. Taking into account the ratio of these swells that coincided with expected offshore winds, and given the fact that Annascaul Rivermouth is quite sheltered from open water swells, we think that that clean surf can be found at Annascaul Rivermouth about 9% of the time and that surf is spoilt by onshore wind 59% of the time. This is means that we expect 19 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.