Slightly Off KIlter

We were out in the hot tub, making like hippos with only our eyes, ears and noses above water, watching the trees in the Back 40 swaying. We've got a local weather advisory for the airport (SFO; 5 mi south-west of our house as the seagull flies) — west winds 25 to 35 kt with occasional gusts near 40 kt. Unfortunately, our anemometer is busted and currently reads 0 all the time, so I don't know exactly how windy it is at our house, but it's windy.