The graph illustrates how frequently and how strongly the wind blows from different directions through a typical November. The longest 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 1680 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Barra da Tijuca, located 33 km away (21 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 dominant wind at Barra da Tijuca blows from the SSE. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at Barra da Tijuca. On the other hand, dominant spokes represent 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 21% of the time (6 days each November) and blows offshore 31% of the time (9 days in an average November). In a typical November winds exceeding >40kph (25mph) are not expected, but 0 have winds on the range 30-40 (19-25) at Barra da Tijuca
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.