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Vota 25

Surf Report Feed

25 Swell Statistics, Dicembre: Surf with Light or Offshore Winds

This image shows only the swells directed at 25 that coincided with light winds or offshore conditions through a typical December and is based upon 2705 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 represent increasing swell sizes and red illustrates biggest swells greater than >3m (>10ft). In both graphs, the area of any colour is proportional to how frequently that size swell happens.

The diagram suggests that the dominant swell direction, shown by the longest spokes, was NW, whereas the the prevailing wind blows from the NE. 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 42% of the time, equivalent to 13 days. Open water swells exceeding >3m (>10ft) only arise 3% of the time in a typical December, equivalent to just one day but 20% of the time we expect swell in the range 2-3m (6.5-10ft) 20%, equivalent to (6 days). Taking into account the ratio of these swells that coincided with forecast offshore winds, and given the fact that 25 is slightly protected from open water swells, we calculate that clean surf can be found at 25 about 42% of the time and that surf is blown out by onshore wind 42% of the time. This is means that we expect 25 days with waves in a typical December, of which 13 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.