The graph describes how commonly 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 dark blue strongest. It is based on 5144 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Carrownisky, located 27 km away (17 miles). There are too few recording stations world wide to use actual wind data. Without question some coastal places have very localized wind effects that would not be predicted by NWW3.
According to the model, the most common wind at Carrownisky blows from the W. If the rose plot shows a nearly round shape, it means there is no strong bias in wind direction at Carrownisky. Converseley, dominant spokes show favoured directions, and the more the darkest shade of 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 5% of the time (5 days each northern hemisphere autumn) and blows offshore 18% of the time (16 days in an average northern hemisphere autumn). During a typical northern hemisphere autumn winds stronger than >40kph (25mph) are expected on 15 days at Carrownisky
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.