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Weather Chart arrow FAQs arrow Weather charts arrow Significant Wave Height (WWIII HSIG) Wavewatch 3
Significant Wave Height (WWIII HSIG) Wavewatch 3 Print
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WW3 stands for WaveWatch III. It is a wave model developed by NOAA/NCEP. 
The model displaysSIgnificant wave Height (HSIG) and wave direction at 3 hour intervals out to 180 hours. Significant wave height is the average crest to trough height of the highest 33% of waves in a given sample period (typically 20 to 30 minutes). 

Caution ! The maximum wave height can be up to twice the HSIG.
 
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