Groenvlei Wind Stats

This chart describes how often and how strongly the wind blows from different directions over a normal July. The largest spokes point in the directions the wind most commonly blows from and the shade of blue suggests the strength, with deep blue showing the strongest winds. It is based on 3472 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Groenvlei, located 56 km away (35 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 most common wind at Groenvlei blows from the SSW. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at Groenvlei. By contrast, dominant spokes represent favoured directions, and the more dark blue, the stronger the wind. Spokes point in the direction the wind blows from. During a typical July, the model suggests that winds are light enough for the sea to be glassy (pale blue) about 12% of the time (4 days each July) and blows offshore 52% of the time (16 days in an average July). Over an average July winds stronger than >40kph (25mph) are expected on 5 days at Groenvlei

read more