This picture describes how commonly and how strongly the wind blows from different directions through a typical southern hemisphere autumn. The largest 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 4850 NWW3 forecasts of wind since since 2007, at 3hr intervals, for the closest NWW3 model node to Labuhan Haji, located 30 km away (19 miles). There are insufficient 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 prevailing wind at Labuhan Haji blows from the SW. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at Labuhan Haji. By contrast, dominant spokes illustrate favoured directions, and the more deep blue, the stronger the wind. Spokes point in the direction the wind blows from. Over an average southern hemisphere autumn, the model suggests that winds are light enough for the sea to be glassy (light blue) about 30% of the time (27 days each southern hemisphere autumn) and blows offshore 43% of the time (32 days in an average southern hemisphere autumn). During a typical southern hemisphere autumn winds exceeding >40kph (25mph) are not expected, but 1 have winds on the range 30-40 (19-25) at Labuhan Haji
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.