Arrifana Wind Statistics, Settembre averages since 2006
The figure shows how often and how strongly the wind blows from different directions over a normal September. The longest spokes point in the directions the wind most commonly blows from and the shade of blue implies the strength, with dark blue strongest. It is based on 2400 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Arrifana, located 26 km away (16 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 Arrifana blows from the NW. If the rose graph shows a fairly circular pattern, it means there is no strong bias in wind direction at Arrifana. Converseley, 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 September, the model suggests that winds are light enough for the sea to be glassy (pale blue) about 18% of the time (5 days each September) and blows offshore 44% of the time (5 days in an average September). Over an average September winds exceeding >40kph (25mph) are not expected, but 2 have winds on the range 30-40 (19-25) at Arrifana
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.