Click on forecast then wave maps from the left menu bar. The wave model is run by PredictWind, using data from the 50 kilometer resolution PredictWind PWG and PWE wind models.
The colour gradients show the significant wave height for swell and wind waves, the black arrows show the primary wave direction, and the contours indicate the mean swell period in seconds.
The wave height is the mean wave height from trough to crest of the highest third of the waves, which is known as the 'significant wave height'. The significant wave height is generated from the primary swell and also the local wind wave. As the significant wave height is an average, it is possible you may encounter a wave that is roughtly double the signifcant wave height depending on the conditions. By moving your cursor over the map you can see the wave height, period and direction.
Use the animation controls to play or pause the animation, or click on the timeline to jump to a forecast time. Use the zoom controls on the map or your mouse wheel, or the trackpad in your laptop to control your view.