When I'm windsurfing on the north sea, I like the white horses at the horizon showing up. (by the way the french call it white sheep -les moutons blancs).
But on my cat that's a whole different story.
Later on I found out, they were registrated gusts of 35-40 knots

watch:

http://www.youtube.com/watch?v=fbpc_evUIHE&feature=channel&l=UL