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Uchizuma ratings
Quality on a good day: 2.0
Consistency of Surf: 2.0
Difficulty Level: 1.0
Crowds: 3.0

Overall: 2.7

See all 18 ratings

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Surf Report Feed

Uchizuma Swell Statistics, Autumn: Surf with Light or Offshore Winds

This image shows only the swells directed at Uchizuma that coincided with light winds or offshore conditions through a typical northern hemisphere autumn. It is based on 8724 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 largest swells greater than >3m (>10ft) are shown in red. In both graphs, the area of any colour is proportional to how frequently that size swell happens.

The diagram suggests that the most common swell direction, shown by the largest spokes, was SE, whereas the the most common wind blows from the N. 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 14% of the time, equivalent to 13 days. Open water swells exceeding >3m (>10ft) only arise 1.0% of the time in a typical northern hemisphere autumn, equivalent to just one day but 4% of the time we expect swell in the range 2-3m (6.5-10ft) 4%, equivalent to (4 days). Taking into account the ratio of these swells that coincided with predicted offshore winds, and given the fact that Uchizuma is slightly protected from open water swells, we think that that clean surf can be found at Uchizuma about 14% of the time and that surf is messed up by onshore wind 13% of the time. This is means that we expect 25 days with waves in a typical northern hemisphere autumn, of which 13 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.