The graph describes how commonly and how strongly the wind blows from different directions over a normal northern hemisphere autumn. The longest spokes point in the directions the wind most commonly blows from and the shade of blue suggests the strength, with dark 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 RC's, located 22 km away (14 miles). There are too few 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 RC's blows from the ENE. If the rose graph shows a fairly circular pattern, it means there is no strong bias in wind direction at RC's. 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. During a typical northern hemisphere autumn, the model suggests that winds are light enough for the sea to be glassy (pale blue) about 15% of the time (14 days each northern hemisphere autumn) and blows offshore 30% of the time (20 days in an average northern hemisphere autumn). Over an average northern hemisphere autumn wind stronger than >40kph (25mph) was predicted for only a single days at RC's
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.