Barra do Douro Wind Stats

The graph describes how commonly and how strongly the wind blows from different directions over a normal September. The biggest spokes point in the directions the wind most commonly blows from and the shade of blue implies the strength, with dark blue strongest. It is based on 3360 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 not enough recording stations world wide to use actual wind data. Invevitably some coastal places have very localized wind effects that would not be predicted by NWW3. According to the model, the dominant wind at Barra do Douro blows from the WNW. If the rose plot shows a nearly round shape, it means there is no strong bias in wind direction at Barra do Douro. By contrast, 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. During a typical September, the model suggests that winds are light enough for the sea to be glassy (pale blue) about 21% of the time (6 days each September) and blows offshore 27% of the time (8 days in an average September). Over an average September wind stronger than >40kph (25mph) was expected for only a single days at Barra do Douro

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