The rose diagram illustrates how often 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 suggests the strength, with the strongest winds shown by the darkest shade of blue. It is based on 5140 NWW3 forecasts of wind since since 2007, at 3hr intervals, for the closest NWW3 model node to Scottburgh Point, located 31 km away (19 miles). There are not enough 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 Scottburgh Point blows from the S. If the rose graph shows a fairly circular pattern, it means there is no strong bias in wind direction at Scottburgh Point. Converseley, dominant spokes show favoured directions, and the more dark 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 (the lightest shade of blue) about 12% of the time (11 days each southern hemisphere autumn) and blows offshore 31% of the time (23 days in an average southern hemisphere autumn). Over an average southern hemisphere autumn winds stronger than >40kph (25mph) are expected on 2 days at Scottburgh 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.