The rose diagram illustrates how often and how strongly the wind blows from different directions over a normal March. The longest spokes point in the directions the wind most commonly blows from and the shade of blue suggests the strength, with the strongest winds shown by the darkest shade of blue. It is based on 1724 NWW3 forecasts of wind since since 2007, at 3hr intervals, for the closest NWW3 model node to Fort Cronkhite (Rodeo Beach), located 37 km away (23 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 Fort Cronkhite (Rodeo Beach) blows from the SW. If the rose plot shows a nearly round shape, it means there is no strong bias in wind direction at Fort Cronkhite (Rodeo Beach). By contrast, dominant spokes show favoured directions, and the more the darkest shade of blue, the stronger the wind. Spokes point in the direction the wind blows from. During a typical March, the model suggests that winds are light enough for the sea to be glassy (light blue) about 1.9% of the time (1 days each March) and blows offshore just 2% of the time (1 days in an average March). Over an average March winds exceeding >40kph (25mph) are not expected, but 0 have winds on the range 30-40 (19-25) at Fort Cronkhite (Rodeo 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.