Wave Heights in Gulf Stream Nomogram

gulf wind wave nomogram

Significant wave heights over the Gulf Stream for wind speed/direction with an 18 hour duration. Red contours trace the wave height. Note that a 20 knot northeast wind can build sea heights in the Gulf Stream to around 12 feet and a 15 knot northeast wind can build sea heights to about 9 feet!

Boaters sometimes complain that the Coastal Waters Forecast underestimates the wave heights, when in fact they actually ventured out into the Gulf Stream when there was a north to northeast wind! Additionally, wave theory predicts that wave heights will occasionally be higher.

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.