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Chuns and Jocks Reefs ratings
Quality on a good day: 4.0
Consistency of Surf: 5.0
Difficulty Level: 3.0
Crowds: 2.0

Overall: 4.0

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Surf Report Feed

Chuns and Jocks Reefs Swell Statistics, Autumn: Surf with Light or Offshore Winds

This image shows only the swells directed at Chuns and Jocks Reefs that coincided with light winds or offshore conditions over a normal northern hemisphere autumn and is based upon 8476 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 show increasing swell sizes and red represents the highest swells, greater than >3m (>10ft). In each graph, the area of any colour is proportional to how commonly that size swell happens.

The diagram implies that the dominant swell direction, shown by the largest spokes, was NNW, whereas the the dominant wind blows from the E. 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 45% of the time, equivalent to 41 days. Expect open water swells to exceed >3m (>10ft) 5% of the time (5 days). Taking into account the ratio of these swells that coincided with predicted offshore winds, and given the fact that Chuns and Jocks Reefs is exposed to open water swells, we estimate that clean surf can be found at Chuns and Jocks Reefs about 45% of the time and that surf is blown out by onshore wind 13% of the time. This is means that we expect 53 days with waves in a typical northern hemisphere autumn, of which 41 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.