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Ulla ratings
Quality on a good day: 5.0
Consistency of Surf: 5.0
Difficulty Level: 4.0
Crowds: 5.0

Overall: 4.7

See all 18 ratings

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Surf Report Feed

Ulla Swell Statistics, December: Surf with Light or Offshore Winds

The rose diagram shows only the swells directed at Ulla that coincided with light winds or offshore conditions through a typical December. It is based on 2953 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 red represents largest swells greater than >3m (>10ft). In either graph, the area of any colour is proportional to how frequently that size swell occurs.

The diagram suggests that the most common swell direction, shown by the largest spokes, was NW, whereas the the most common wind blows from the SSW. 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 44% of the time, equivalent to 13 days. Open water swells exceeding >3m (>10ft) only happen 1.9% of the time in a typical December, equivalent to just one day but 14% of the time we expect swell in the range 2-3m (6.5-10ft) 14%, equivalent to (4 days). Taking into account the ratio of these swells that coincided with expected offshore winds, and given the fact that Ulla is exposed to open water swells, we estimate that clean surf can be found at Ulla about 44% of the time and that surf is messed up by onshore wind 46% of the time. This is means that we expect 27 days with waves in a typical December, of which 13 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.