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Sponge bay ratings
Quality on a good day: 2.5
Consistency of Surf: 3.5
Difficulty Level: 2.0
Wind and Kite Surfing: 1.0
Crowds: 3.5

Overall: 3.1

See all 18 ratings

Based on 2 votes. Vote


Surf Report Feed

Sponge bay Swell Statistics, February: Surf with Light or Offshore Winds

The rose diagram shows only the swells directed at Sponge bay that coincided with light winds or offshore conditions through a typical February. It is based on 2440 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 show increasing swell sizes and largest swells greater than >3m (>10ft) are shown in red. In either graph, the area of any colour is proportional to how frequently that size swell occurs.

The diagram suggests that the dominant swell direction, shown by the largest spokes, was SE, whereas the the most common wind blows from the ENE. 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 17% of the time, equivalent to 5 days. Open sea swells exceeding >3m (>10ft) are unlikely to happen in a normal February but 13% of the time you can expect swell in the range 1.3-2m (4-6.5ft) 13%, equivalent to (4 days). Taking into account the fraction of these swells that coincided with expected offshore winds, and given the fact that Sponge bay is slightly protected from open water swells, we calculate that clean surf can be found at Sponge bay about 17% of the time and that surf is blown out by onshore wind 30% of the time. This is means that we expect 13 days with waves in a typical February, of which 5 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.