This chart describes how commonly and how strongly the wind blows from different directions over a normal year. The biggest spokes point in the directions the wind most commonly blows from and the shade of blue indicates the strength, with the darkest shade of blue showing the strongest winds. It is based on 20068 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Port Louis, located 9 km away (6 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 Port Louis blows from the NNE. If the rose plot shows a nearly round shape, it means there is no strong bias in wind direction at Port Louis. Converseley, dominant spokes show 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 year, the model suggests that winds are light enough for the sea to be glassy (light blue) about 1.8% of the time (7 days each year) and blows offshore just 34% of the time (124 days in an average year). Over an average year wind stronger than >40kph (25mph) was forecast for only a single days at Port Louis
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.