Copa (Bull Bay) Wind Stats

The rose diagram describes how commonly and how strongly the wind blows from different directions over a normal September. The largest spokes point in the directions the wind most commonly blows from and the shade of blue suggests the strength, with the darkest shade of blue strongest. It is based on 3360 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Copa (Bull Bay), located 53 km away (33 miles). There are not enough 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 Copa (Bull Bay) blows from the ESE. If the rose plot shows a nearly round shape, it means there is no strong bias in wind direction at Copa (Bull Bay). By contrast, dominant spokes represent 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 (the lightest shade of blue) about 6% of the time (2 days each September) and blows offshore 8% of the time (2 days in an average September). Over an average September winds exceeding >40kph (25mph) are not expected, but 4 have winds on the range 30-40 (19-25) at Copa (Bull Bay)

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