Rossnowlagh Wind Statistics, May averages since 2006
The graph shows how commonly and how strongly the wind blows from different directions through a typical May. The largest spokes point in the directions the wind most commonly blows from and the shade of blue indicates the strength, with dark blue strongest. It is based on 2200 NWW3 forecasts of wind since since 2007, at 3hr intervals, for the closest NWW3 model node to Rossnowlagh, located 50 km away (31 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 dominant wind at Rossnowlagh blows from the W. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at Rossnowlagh. By contrast, dominant spokes illustrate favoured directions, and the more dark blue, the stronger the wind. Spokes point in the direction the wind blows from. Over an average May, the model suggests that winds are light enough for the sea to be glassy (the lightest shade of blue) about 5% of the time (2 days each May) and blows offshore 25% of the time (2 days in an average May). During a typical May winds stronger than >40kph (25mph) are expected on 3 days at Rossnowlagh
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.