Here’s an unusual and interesting resource. The U.S. Geological Survey has a website that shows current wind conditions around the San Francisco Bay Area (they are considering a predictive model as well). There are two or three visualizations available, including the very cool flash “streaklines” (which unfotunately I can’t display here, and which might not work on some systems).
In the visualization above, the arrow size indicates exact speed (in knots, which are equal to 1.15 mph or 1.85 kph), while the color shows a certain range of speed. Speeds are at 10 meters and directions from true north. You can see that this morning there were strong winds blowing toward the Golden Gate from Marin, across midpeninsula, and at Mount Diablo.