This picture illustrates how commonly and how strongly the wind blows from different directions over a normal northern hemisphere autumn. The longest spokes point in the directions the wind most commonly blows from and the shade of blue suggests the strength, with deep blue strongest. It is based on 5142 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Rest Bay, located 20 km away (12 miles). There are too few recording stations world wide to use actual wind data. Without question some coastal places have very localized wind effects that would not be predicted by NWW3.
According to the model, the dominant wind at Rest Bay blows from the WSW. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at Rest Bay. 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. During a typical northern hemisphere autumn, the model suggests that winds are light enough for the sea to be glassy (pale blue) about 7% of the time (6 days each northern hemisphere autumn) and blows offshore 21% of the time (2 days in an average northern hemisphere autumn). Over an average northern hemisphere autumn winds stronger than >40kph (25mph) are expected on 9 days at Rest Bay
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.