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Umzumbe ratings
Quality on a good day: 3.0
Consistency of Surf: 3.0
Difficulty Level: 2.5
Wind and Kite Surfing: 1.0
Crowds: 2.5

Overall: 1.7

See all 18 ratings

Based on 2 votes. Vote


Surf Report Feed

Umzumbe Swell Statistics, May: Surf with Light or Offshore Winds

This image shows only the swells directed at Umzumbe that coincided with light winds or offshore conditions through a typical May. It is based on 2696 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 biggest swells greater than >3m (>10ft) are shown in red. In either graph, the area of any colour is proportional to how commonly that size swell happens.

The diagram implies that the dominant swell direction, shown by the largest spokes, was SSW, whereas the the prevailing wind blows from the NNW. 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 21% of the time, equivalent to 7 days. Open water swells exceeding >3m (>10ft) only arise 2% of the time in a typical May, equivalent to just one day but 9% of the time we expect swell in the range 2-3m (6.5-10ft) 9%, equivalent to (3 days). Taking into account the proportion of these swells that coincided with forecast offshore winds, and given the fact that Umzumbe is slightly protected from open water swells, we calculate that clean surf can be found at Umzumbe about 21% of the time and that surf is blown out by onshore wind 34% of the time. This is means that we expect 17 days with waves in a typical May, of which 7 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.