This picture describes how frequently and how strongly the wind blows from different directions over a normal southern hemisphere autumn. The longest spokes point in the directions the wind most commonly blows from and the shade of blue implies the strength, with dark blue showing the strongest winds. It is based on 4842 NWW3 forecasts of wind since since 2007, at 3hr intervals, for the closest NWW3 model node to Buxton Point, located 27 km away (17 miles). There are too few recording stations world wide to use actual wind data. Invevitably some coastal places have very localized wind effects that would not be predicted by NWW3.
According to the model, the prevailing wind at Buxton Point blows from the ESE. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at Buxton Point. On the other hand, dominant spokes represent favoured directions, and the more deep blue, the stronger the wind. Spokes point in the direction the wind blows from. During a typical southern hemisphere autumn, the model suggests that winds are light enough for the sea to be glassy (pale blue) about 12% of the time (11 days each southern hemisphere autumn) and blows offshore 43% of the time (34 days in an average southern hemisphere autumn). Over an average southern hemisphere autumn wind stronger than >40kph (25mph) was expected for only a single days at Buxton Point
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.