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Japs ratings
Quality on a good day: 3.3
Consistency of Surf: 2.7
Difficulty Level: 3.7
Wind and Kite Surfing: 1.0
Crowds: 3.3

Overall: 3.2

See all 18 ratings

Based on 3 votes. Vote


Surf Report Feed

Japs Swell Statistics, June: Surf with Light or Offshore Winds

This image shows only the swells directed at Japs that coincided with light winds or offshore conditions through a typical June. It is based on 2786 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 highest swells greater than >3m (>10ft). In each graph, the area of any colour is proportional to how frequently that size swell occurs.

The diagram suggests that the prevailing swell direction, shown by the biggest spokes, was SW, whereas the the dominant wind blows from the NW. 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 53% of the time, equivalent to 16 days. Open water swells exceeding >3m (>10ft) only happen 3% of the time in a typical June, equivalent to just one day but 28% of the time we expect swell in the range 2-3m (6.5-10ft) 28%, equivalent to (8 days). Taking into account the proportion of these swells that coincided with predicted offshore winds, and given the fact that Japs is exposed to open water swells, we estimate that clean surf can be found at Japs about 53% of the time and that surf is blown out by onshore wind 44% of the time. This is means that we expect 29 days with waves in a typical June, of which 16 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.