The rose diagram shows how often and how strongly the wind blows from different directions through a typical May. The longest spokes point in the directions the wind most commonly blows from and the shade of blue indicates the strength, with dark blue strongest. It is based on 1736 NWW3 forecasts of wind since since 2007, at 3hr intervals, for the closest NWW3 model node to Vaucottes, located 35 km away (22 miles). There are too few recording stations world wide to use actual wind data. No doubt some coastal places have very localized wind effects that would not be predicted by NWW3.
According to the model, the most common wind at Vaucottes blows from the WSW. If the rose graph shows a fairly circular pattern, it means there is no strong bias in wind direction at Vaucottes. By contrast, dominant spokes show favoured directions, and the more deep blue, the stronger the wind. Spokes point in the direction the wind blows from. Over an average May, the model suggests that winds are light enough for the sea to be glassy (pale blue) about 6% of the time (2 days each May) and blows offshore 12% of the time (2 days in an average May). During a typical May winds stronger than >40kph (25mph) are expected on 2 days at Vaucottes
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.