This image shows how commonly and how strongly the wind blows from different directions over a normal northern hemisphere summer. The longest spokes point in the directions the wind most commonly blows from and the shade of blue indicates the strength, with dark blue strongest. It is based on 5065 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Good Harbor Beach, located 18 km away (11 miles). There are too few 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 Good Harbor Beach blows from the ENE. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at Good Harbor Beach. By contrast, dominant spokes illustrate favoured directions, and the more deep blue, the stronger the wind. Spokes point in the direction the wind blows from. During a typical northern hemisphere summer, the model suggests that winds are light enough for the sea to be glassy (the lightest shade of blue) about 3% of the time (3 days each northern hemisphere summer) and blows offshore just 8% of the time (0 days in an average northern hemisphere summer). Over an average northern hemisphere summer wind stronger than >40kph (25mph) was forecast for only a single days at Good Harbor Beach
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.