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Bolt Head ratings
Quality on a good day: 4.0
Consistency of Surf: 2.0
Difficulty Level: 4.0

Overall: 3.0

See all 18 ratings

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Surf Report Feed

Bolt Head Swell Statistics, December: Surf with Light or Offshore Winds

This image shows only the swells directed at Bolt Head that coincided with light winds or offshore conditions over a normal December. It is based on 2953 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 represent increasing swell sizes and red shows the largest swells, greater than >3m (>10ft). In both graphs, the area of any colour is proportional to how frequently that size swell was forecast.

The diagram suggests that the dominant swell direction, shown by the longest spokes, was WSW, whereas the the most common wind blows from the W. 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 25% of the time, equivalent to 8 days. Expect open water swells to exceed >3m (>10ft) 5% of the time (2 days). Taking into account the fraction of these swells that coincided with forecast offshore winds, and given the fact that Bolt Head is slightly protected from open water swells, we calculate that clean surf can be found at Bolt Head about 25% of the time and that surf is messed up by onshore wind 36% of the time. This is means that we expect 18 days with waves in a typical December, of which 8 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.

FEATURE UPDATE: we now show red swell icons for 'open sea' swells that are travelling in an unfavourable direction for the surf break. In places, these swells may still wrap around coastlines and produce smaller waves at some breaks. They are also significant for windsurfers and other water users that tend to venture further off-shore.