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Surf Break Rating

Rate Zoo (Bull Bay)


Surf Report Feed

Zoo (Bull Bay) Swell Statistics, Spring: Surf with Light or Offshore Winds

The rose diagram shows only the swells directed at Zoo (Bull Bay) that coincided with light winds or offshore conditions through a typical northern hemisphere spring. It is based on 6580 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 the biggest swells, greater than >3m (>10ft). In either graph, the area of any colour is proportional to how commonly that size swell was forecast.

The diagram implies that the dominant swell direction, shown by the largest spokes, was ESE, whereas the the prevailing 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 7% of the time, equivalent to 6 days. Open sea swells exceeding >3m (>10ft) are unlikely to occur in a normal northern hemisphere spring. Taking into account the fraction of these swells that coincided with forecast offshore winds, and given the fact that Zoo (Bull Bay) is exposed to open water swells, we estimate that clean surf can be found at Zoo (Bull Bay) about 7% of the time and that surf is spoilt by onshore wind 77% of the time. This is means that we expect 76 days with waves in a typical northern hemisphere spring, of which 6 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.