Barra do Douro Wind Stats

The rose diagram illustrates how commonly and how strongly the wind blows from different directions through a typical July. The largest spokes point in the directions the wind most commonly blows from and the shade of blue indicates the strength, with deep blue strongest. It is based on 3720 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 too few 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 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. On the other hand, dominant spokes represent favoured directions, and the more dark blue, the stronger the wind. Spokes point in the direction the wind blows from. Over an average July, the model suggests that winds are light enough for the sea to be glassy (pale blue) about 16% of the time (5 days each July) and blows offshore 17% of the time (5 days in an average July). During a typical July wind stronger than >40kph (25mph) was forecast for only a single days at Barra do Douro

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