Surf Forecast Surf Report

San Francisco Wind Stats

Wind Stats

(% offshore)

All Swells

(any wind direction)

The graph illustrates how often and how strongly the wind blows from different directions through a typical February. The largest spokes point in the directions the wind most commonly blows from and the shade of blue implies the strength, with the darkest shade of blue showing the strongest winds. It is based on 3120 NWW3 forecasts of wind since since 2007, at 3hr intervals, for the closest NWW3 model node to San Francisco, located 25 km away (16 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 prevailing wind at San Francisco blows from the SSE. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at San Francisco. On the other hand, dominant spokes show favoured directions, and the more dark blue, the stronger the wind. Spokes point in the direction the wind blows from. Over an average February, the model suggests that winds are light enough for the sea to be glassy (light blue) about 6% of the time (2 days each February) and blows offshore 13% of the time (3 days in an average February). During a typical February wind stronger than >40kph (25mph) was expected for only a single days at San Francisco

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