Ndana Wind Statistics, August averages since 2006
The rose diagram describes how commonly and how strongly the wind blows from different directions through a typical August. The largest spokes point in the directions the wind most commonly blows from and the shade of blue implies the strength, with deep blue strongest. It is based on 1984 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Ndana, located 18 km away (11 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 Ndana blows from the SW. If the rose plot shows a nearly round shape, it means there is no strong bias in wind direction at Ndana. 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 August, the model suggests that winds are light enough for the sea to be glassy (pale blue) about 0.4% of the time (0 days each August) and blows offshore just 50% of the time (16 days in an average August). During a typical August winds exceeding >40kph (25mph) are not expected, but 9 have winds on the range 30-40 (19-25) at Ndana
IMPORTANT: Beta version feature! Swell heights are open water values from NWW3. There is no attempt to model near-shore effects. Coastal wave heights will generally be less, especially if the break does not have unobstructed exposure to the open ocean.