This chart shows how commonly and how strongly the wind blows from different directions through a typical March. The biggest spokes point in the directions the wind most commonly blows from and the shade of blue implies the strength, with dark blue showing the strongest winds. It is based on 1228 NWW3 forecasts of wind since since 2009, at 3hr intervals, for the closest NWW3 model node to Southend Reef, located 23 km away (14 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 prevailing wind at Southend Reef blows from the S. If the rose plot shows a nearly round shape, it means there is no strong bias in wind direction at Southend Reef. On the other hand, dominant spokes illustrate 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 March, the model suggests that winds are light enough for the sea to be glassy (light blue) about 0.8% of the time (0 days each March) and blows offshore just 0.9% of the time (0 days in an average March). During a typical March winds stronger than >40kph (25mph) are expected on 2 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.