Big Flat Swell ForecastUnited StatesCAHumboldt CountyBig Flat1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIIBig Flat swell forecast issued today at 4:45 am. Next forecast at approx. 4:45 am.Get WillyWeather+ to remove ads