Where's the wind coming from?
"Synopsis
A ridge of surface high pressure will strengthen across the western Atlantic Ocean through early next week...maintaining a very strong flow of easterly winds across the local waters. The threat for shower activity will be highest in the Atlantic waters...but will be a slight chance at best...as an upper-level ridge of high pressure is forecast to remain in place over the region."
From:
http://weather.unisys.com/
It's all about pressure differential, say between that big high over Bermuda and lower pressures out in the Gulf of Mexico. or at
http://dadecosurf.com/images/tanal.1.gif
The greater the differential, the stronger the winds as in ...
From:
http://www.sailflow.com/