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The 9-band height gives the 30-minute height and direction for each swell component.
Long, gradual swells are on the left, short steep chop is on the right.
Tap or hover over a bar to see the exact height and direction of the wave period band.
The shape of the graph's component swells tells you about the sea state:
A single peak on the left half of the graph indicates a clean, strong swell. These longer period waves are more powerful and translate to higher surf.
Broad or multiple peaks, usually on the right side of the graph, are generated nearby and may indicate bumpier, more confused seas.
The last bar on the right measures short-period wind waves and chop (6-2 second periods). Wave heights in open water may reach the height indicated, but surf heights for wave periods this short are much lower and are usually not surfable.
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