I only raced on Saturday and I don't know the actual wind speeds. They got in four races (all start A C A C finish). The wind speed and gusts increased over the course of the day. Not much to start with, but by the 3rd and 4th races boats were flipping in some of the gusts. On the last downwind leg of the 4th race, we flipped while jibing (our helm response became really sensitive as the wind came up, which made jibing difficult).