Arniston Wind Stats

The rose diagram describes how commonly and how strongly the wind blows from different directions through a typical April. The longest spokes point in the directions the wind most commonly blows from and the shade of blue implies the strength, with the darkest shade of blue showing the strongest winds. It is based on 3360 NWW3 forecasts of wind since since 2007, at 3hr intervals, for the closest NWW3 model node to Arniston, located 165 km away (103 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 Arniston blows from the SSW. If the rose graph shows a fairly circular pattern, it means there is no strong bias in wind direction at Arniston. On the other hand, dominant spokes illustrate favoured directions, and the more deep blue, the stronger the wind. Spokes point in the direction the wind blows from. Over an average April, the model suggests that winds are light enough for the sea to be glassy (light blue) about 12% of the time (4 days each April) and blows offshore 39% of the time (12 days in an average April). During a typical April winds stronger than >40kph (25mph) are expected on 3 days at Arniston

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