Just some info on Swells which don't neccessarily result in high waves but more prolonged surging waves formations...
Swells are wind waves, often born of storms, that propagate away from the point where they originated. Wave height is a measurement of a wave from its trough to its crest.
Characteristics of SwellsSwells generally have longer periods and less chop (flatter crests) than other wind waves.
Wave PropertiesWaves are measured by their height,
wavelength and period as indicated in the chart above

. The height of a wave is the measurement from trough to crest. The
wavelength measures the distance between two adjacent wave crests or two adjacent wave troughs. The period is the time it takes for two wave crests (or wave troughs) to pass a given spot.
Significant Wave Height MeasurementSensors record the height of waves. Wave height is calculated from the average height of the largest third of waves over a 30-minute period.
Highest Wave
While the significant wave height is an average, the highest single wave over a given time usually measures almost twice the significant wave height.
Wave SetsSwells arriving at the same time from different points may have similar periods. When the crests of one swell coincide with the crests of another swell, this produces a higher wave height (this is known as constructive interference). Sets of smaller waves usually follow sets of larger waves, as the difference in period of the two swells shifts the crest height of one swell to the trough of the other swell (this is called destructive interference).