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Jacobs Bay ratings
Quality on a good day: 4.0
Consistency of Surf: 3.0
Difficulty Level: 1.0
Crowds: 3.0

Overall: 3.2

See all 18 ratings

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Surf Report Feed

Jacobs Bay Swell Statistics, August: Surf with Light or Offshore Winds

The rose diagram shows only the swells directed at Jacobs Bay that coincided with light winds or offshore conditions through a typical August. It is based on 2976 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 illustrate increasing swell sizes and red shows the largest 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 prevailing swell direction, shown by the biggest spokes, was SW (which was the same as the most common wind direction). 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 26% of the time, equivalent to 8 days. Expect open water swells to exceed >3m (>10ft) 6% of the time (2 days). Taking into account the ratio of these swells that coincided with forecast offshore winds, and given the fact that Jacobs Bay is exposed to open water swells, we calculate that clean surf can be found at Jacobs Bay about 26% of the time and that surf is blown out by onshore wind 71% of the time. This is means that we expect 30 days with waves in a typical August, of which 8 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.