Estadísticas de Viento para Barra do Douro, Promedio de Verano desde 2006

The graph describes how often and how strongly the wind blows from different directions over a normal northern hemisphere summer. The longest spokes point in the directions the wind most commonly blows from and the shade of blue implies the strength, with the strongest winds shown by dark blue. It is based on 7266 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Barra do Douro, located 32 km away (20 miles). There are insufficient 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 Barra do Douro blows from the WNW. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at Barra do Douro. By contrast, dominant spokes show 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 summer, the model suggests that winds are light enough for the sea to be glassy (pale blue) about 16% of the time (15 days each northern hemisphere summer) and blows offshore 19% of the time (16 days in an average northern hemisphere summer). Over an average northern hemisphere summer winds stronger than >40kph (25mph) are expected on 2 days at Barra do Douro

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.