The figure illustrates how frequently and how strongly the wind blows from different directions through a typical 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 strongest winds shown by dark blue. It is based on 5144 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Buma, located 43 km away (27 miles). There are not enough 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 dominant wind at Buma blows from the N. If the rose plot shows a nearly round shape, it means there is no strong bias in wind direction at Buma. Converseley, dominant spokes represent favoured directions, and the more deep blue, the stronger the wind. Spokes point in the direction the wind blows from. Over an average northern hemisphere autumn, the model suggests that winds are light enough for the sea to be glassy (pale blue) about 3% of the time (3 days each northern hemisphere autumn) and blows offshore just 56% of the time (17 days in an average northern hemisphere autumn). During a typical northern hemisphere autumn winds stronger than >40kph (25mph) are expected on 9 days at Buma
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.