The rose diagram shows how commonly and how strongly the wind blows from different directions through a typical November. The biggest spokes point in the directions the wind most commonly blows from and the shade of blue implies the strength, with dark blue showing the strongest winds. It is based on 1678 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Faro de Trafalgar, located 21 km away (13 miles). There are not enough 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 prevailing wind at Faro de Trafalgar blows from the W. If the rose graph shows a fairly circular pattern, it means there is no strong bias in wind direction at Faro de Trafalgar. On the other hand, dominant spokes illustrate favoured directions, and the more deep blue, the stronger the wind. Spokes point in the direction the wind blows from. Over an average November, the model suggests that winds are light enough for the sea to be glassy (the lightest shade of blue) about 9% of the time (3 days each November) and blows offshore 16% of the time (4 days in an average November). In a typical November wind stronger than >40kph (25mph) was expected for only a single days at Faro de Trafalgar
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.