Statistiques de Houle pour Modrono, Été: Vagues avec Vents Légers ou Favorables.

This image shows only the swells directed at Modrono that coincided with light winds or offshore conditions through a typical northern hemisphere summer and is based upon 7266 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours illustrate increasing wave sizes. Blue shows the smallest swells, less that 0.5m (1.5 feet) high. Green and yellow represent increasing swell sizes and red represents the biggest swells, greater than >3m (>10ft). In each graph, the area of any colour is proportional to how often that size swell occurs.

The diagram indicates that the dominant swell direction, shown by the largest spokes, was SSW, whereas the the prevailing 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 69% of the time, equivalent to 63 days. Open sea swells exceeding >3m (>10ft) are unlikely to happen in a normal northern hemisphere summer but 10% of the time we expect swell in the range 2-3m (6.5-10ft) 10%, equivalent to (9 days). Taking into account the fraction of these swells that coincided with forecast offshore winds, and given the fact that Modrono is exposed to open water swells, we calculate that clean surf can be found at Modrono about 69% of the time and that surf is blown out by onshore wind 31% of the time. This is means that we expect 91 days with waves in a typical northern hemisphere summer, of which 63 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.