This image describes how commonly and how strongly the wind blows from different directions through a typical January. The biggest spokes point in the directions the wind most commonly blows from and the shade of blue indicates the strength, with the strongest winds shown by deep blue. It is based on 1728 NWW3 forecasts of wind since since 2007, at 3hr intervals, for the closest NWW3 model node to Imperial Beach, located 36 km away (22 miles). There are insufficient 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 Imperial Beach blows from the WSW. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at Imperial Beach. On the other hand, 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 January, the model suggests that winds are light enough for the sea to be glassy (pale blue) about 23% of the time (7 days each January) and blows offshore 38% of the time (12 days in an average January). During a typical January winds exceeding >40kph (25mph) are not expected, but 1 have winds on the range 30-40 (19-25) at Imperial 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.