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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, Printemps: Vagues avec Vents Légers ou Favorables.

The rose diagram shows only the swells directed at Derrs that coincided with light winds or offshore conditions over a normal southern hemisphere spring. It is based on 8476 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 illustrate increasing swell sizes and red shows highest swells greater than >3m (>10ft). In either graph, the area of any colour is proportional to how commonly that size swell was forecast.

The diagram implies that the dominant swell direction, shown by the largest spokes, was WSW, whereas the the dominant wind blows from the S. 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 28% of the time, equivalent to 25 days. Open water swells exceeding >3m (>10ft) only occur 1.4% of the time in a typical southern hemisphere spring, equivalent to just one day but 7% of the time we expect swell in the range 2-3m (6.5-10ft) 7%, equivalent to (6 days). Taking into account the fraction of these swells that coincided with predicted offshore winds, and given the fact that Derrs is exposed to open water swells, we estimate that clean surf can be found at Derrs about 28% of the time and that surf is messed up by onshore wind 72% of the time. This is means that we expect 91 days with waves in a typical southern hemisphere spring, of which 25 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.