The rose diagram shows how often and how strongly the wind blows from different directions over a normal June. The largest spokes point in the directions the wind most commonly blows from and the shade of blue indicates the strength, with deep blue strongest. It is based on 1594 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Nuns Beach 1, located 23 km away (14 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 prevailing wind at Nuns Beach 1 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 Nuns Beach 1. On the other hand, dominant spokes show favoured directions, and the more dark blue, the stronger the wind. Spokes point in the direction the wind blows from. During a typical June, the model suggests that winds are light enough for the sea to be glassy (light blue) about 9% of the time (3 days each June) and blows offshore 32% of the time (8 days in an average June). Over an average June winds exceeding >40kph (25mph) are not expected, but 3 have winds on the range 30-40 (19-25) at Nuns Beach 1
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.