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Rossnowlagh ratings
Quality on a good day: 3.8
Consistency of Surf: 3.7
Difficulty Level: 2.2
Wind and Kite Surfing: 3.8
Crowds: 2.8

Overall: 3.7

See all 18 ratings

Based on 9 votes. Vote


Surf Report Feed

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

The rose diagram shows only the swells directed at Rossnowlagh that coincided with light winds or offshore conditions through a typical May. It is based on 2200 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 show increasing swell sizes and highest 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 happens.

The diagram implies that the dominant swell direction, shown by the biggest spokes, was W, whereas the the dominant wind blows from the WSW. 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 8% of the time, equivalent to 2 days. Open sea swells exceeding >3m (>10ft) are unlikely to arise in a normal May but 6% of the time you can expect swell in the range 1.3-2m (4-6.5ft) 6%, equivalent to (2 days). Taking into account the proportion of these swells that coincided with expected offshore winds, and given the fact that Rossnowlagh is slightly protected from open water swells, we estimate that clean surf can be found at Rossnowlagh about 8% of the time and that surf is blown out by onshore wind 48% of the time. This is means that we expect 17 days with waves in a typical May, of which 2 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.