The figure illustrates how frequently and how strongly the wind blows from different directions through a typical April. The largest spokes point in the directions the wind most commonly blows from and the shade of blue indicates the strength, with dark blue showing the strongest winds. It is based on 1638 NWW3 forecasts of wind since since 2007, at 3hr intervals, for the closest NWW3 model node to Harlyn, located 35 km away (22 miles). There are insufficient 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 Harlyn blows from the W. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at Harlyn. On the other hand, dominant spokes show favoured directions, and the more dark blue, the stronger the wind. Spokes point in the direction the wind blows from. Over an average April, the model suggests that winds are light enough for the sea to be glassy (light blue) about 8% of the time (2 days each April) and blows offshore 41% of the time (5 days in an average April). In a typical April winds stronger than >40kph (25mph) are expected on 3 days at Harlyn
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.