The figure illustrates how frequently and how strongly the wind blows from different directions through a typical southern hemisphere spring. 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 5144 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Kilcunda, located 50 km away (31 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 prevailing wind at Kilcunda 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 Kilcunda. Converseley, dominant spokes illustrate 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 southern hemisphere spring, the model suggests that winds are light enough for the sea to be glassy (the lightest shade of blue) about 6% of the time (5 days each southern hemisphere spring) and blows offshore 26% of the time (16 days in an average southern hemisphere spring). During a typical southern hemisphere spring winds stronger than >40kph (25mph) are expected on 15 days at Kilcunda
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.