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Derrs Notations
Qualité quand ça marche: 2.0
Consistance des Vagues: 4.0
Niveau de Difficulté: 1.0
Foule a l'Eau: 3.0

Général: 2.8

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Surf Report Feed

Statistiques de Houle pour Derrs, Août: Vagues avec Vents Légers ou Favorables.

This image shows only the swells directed at Derrs that coincided with light winds or offshore conditions over a normal August and is based upon 2976 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 illustrate increasing swell sizes and largest swells greater than >3m (>10ft) are shown in red. In both graphs, the area of any colour is proportional to how frequently that size swell occurs.

The diagram suggests that the prevailing swell direction, shown by the largest spokes, was WSW, whereas the the most common wind blows from the W. 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 39% of the time, equivalent to 12 days. Open water swells exceeding >3m (>10ft) only happen 2% of the time in a typical August, equivalent to just one day but 15% of the time we expect swell in the range 2-3m (6.5-10ft) 15%, equivalent to (5 days). Taking into account the fraction of these swells that coincided with expected offshore winds, and given the fact that Derrs is exposed to open water swells, we calculate that clean surf can be found at Derrs about 39% of the time and that surf is blown out by onshore wind 61% of the time. This is means that we expect 31 days with waves in a typical August, of which 12 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.