Statistiques de Vent de Aberffraw, moyennes sur Printemps depuis 2006
This image shows how frequently and how strongly the wind blows from different directions through a typical northern hemisphere spring. The largest spokes point in the directions the wind most commonly blows from and the shade of blue indicates the strength, with deep blue strongest. It is based on 6578 NWW3 forecasts of wind since since 2007, at 3hr intervals, for the closest NWW3 model node to Aberffraw, located 20 km away (12 miles). There are insufficient 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 dominant wind at Aberffraw blows from the SW. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at Aberffraw. By contrast, dominant spokes represent favoured directions, and the more the darkest shade of blue, the stronger the wind. Spokes point in the direction the wind blows from. Over an average northern hemisphere spring, the model suggests that winds are light enough for the sea to be glassy (light blue) about 10% of the time (9 days each northern hemisphere spring) and blows offshore 18% of the time (3 days in an average northern hemisphere spring). In a typical northern hemisphere spring winds stronger than >40kph (25mph) are expected on 4 days at Aberffraw
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.