The graph shows how frequently 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 indicates the strength, with the darkest shade of blue showing the strongest winds. It is based on 5144 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Six Men's Bay, located 48 km away (30 miles). There are not enough 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 prevailing wind at Six Men's Bay blows from the NNE. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at Six Men's Bay. 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 northern hemisphere autumn, the model suggests that winds are light enough for the sea to be glassy (light blue) about 1.6% of the time (1 days each northern hemisphere autumn) and blows offshore just 30% of the time (27 days in an average northern hemisphere autumn). Over an average northern hemisphere autumn winds exceeding >40kph (25mph) are not expected, but 5 have winds on the range 30-40 (19-25) at Six Men's 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.