The figure illustrates how commonly and how strongly the wind blows from different directions through a typical northern hemisphere summer. The biggest spokes point in the directions the wind most commonly blows from and the shade of blue implies the strength, with the strongest winds shown by deep blue. It is based on 5078 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to St Joe s Island, located 38 km away (24 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 most common wind at St Joe s Island blows from the SE. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at St Joe s Island. Converseley, 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. Over an average northern hemisphere summer, the model suggests that winds are light enough for the sea to be glassy (the lightest shade of blue) about 8% of the time (7 days each northern hemisphere summer) and blows offshore 9% of the time (5 days in an average northern hemisphere summer). During a typical northern hemisphere summer wind stronger than >40kph (25mph) was expected for only a single days at St Joe s Island
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.