The figure shows how frequently and how strongly the wind blows from different directions over a normal October. The longest spokes point in the directions the wind most commonly blows from and the shade of blue suggests the strength, with deep blue showing the strongest winds. It is based on 1240 NWW3 forecasts of wind since since 2008, at 3hr intervals, for the closest NWW3 model node to Southend Reef, located 23 km away (14 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 prevailing wind at Southend Reef blows from the S. If the rose graph shows a fairly circular pattern, it means there is no strong bias in wind direction at Southend Reef. Converseley, dominant spokes represent favoured directions, and the more dark blue, the stronger the wind. Spokes point in the direction the wind blows from. During a typical October, the model suggests that winds are light enough for the sea to be glassy (the lightest shade of blue) about 0.7% of the time (0 days each October) and blows offshore just 1.9% of the time (0 days in an average October). Over an average October winds stronger than >40kph (25mph) are expected on 5 days at Southend Reef
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.