The figure describes how often and how strongly the wind blows from different directions through a typical northern hemisphere autumn. The largest spokes point in the directions the wind most commonly blows from and the shade of blue suggests the strength, with deep 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 Walton Rocks (Power Plant), located 29 km away (18 miles). There are too few 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 prevailing wind at Walton Rocks (Power Plant) blows from the NE. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at Walton Rocks (Power Plant). Converseley, dominant spokes illustrate favoured directions, and the more dark 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 (light blue) about 13% of the time (12 days each northern hemisphere autumn) and blows offshore 27% of the time (21 days in an average northern hemisphere autumn). During a typical northern hemisphere autumn winds stronger than >40kph (25mph) are expected on 3 days at Walton Rocks (Power Plant)
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.