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Sumner Bar ratings
Quality on a good day: 4.1
Consistency of Surf: 1.9
Difficulty Level: 3.0
Wind and Kite Surfing: 2.2
Crowds: 3.8

Overall: 3.5

See all 18 ratings

Based on 13 votes. Vote


Surf Report Feed

Sumner Bar Swell Statistics, January: Surf with Light or Offshore Winds

This image shows only the swells directed at Sumner Bar that coincided with light winds or offshore conditions through a typical January and is based upon 2868 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours illustrate increasing wave sizes. Blue shows the smallest swells, less that 0.5m (1.5 feet) high. Green and yellow illustrate increasing swell sizes and biggest swells greater than >3m (>10ft) are shown in red. In both graphs, the area of any colour is proportional to how commonly that size swell occurs.

The diagram implies that the dominant swell direction, shown by the longest spokes, was E, whereas the the prevailing wind blows from the NNE. 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 4% of the time, equivalent to 1 days. Open sea swells exceeding >3m (>10ft) are unlikely to happen in a normal January. Taking into account the fraction of these swells that coincided with expected offshore winds, and given the fact that Sumner Bar is slightly protected from open water swells, we think that that clean surf can be found at Sumner Bar about 4% of the time and that surf is blown out by onshore wind 9% of the time. This is means that we expect 4 days with waves in a typical January, of which 1 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.