is when you add in the forward motion with the wind that s already spinning. so let s just talk about number 4 right here. this is how the wind is spinning. and it s spinning at 150. let s daul it a guts of 150. hopefully 120. of but if you move this storm forward by 20 miles per hour, then you have to add 150 plus 20 because of the forward motion, all of a sudden you have 170. if you re on the clean side of the eye, this side, you have 150, minus 20. so all of a sudden your wind on this side is 130. a gust of 130 is a lot different than a gust of 170 because that s ugly. back to you. thanks. we re here in miami beach in the dirty end probably of what irma will deliver. the entire florida keys right now under a mandatory evacuation