Spanish Flat Swell ForecastUnited StatesCAHumboldt CountySpanish Flat1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIISpanish Flat swell forecast issued yesterday at 9:44 pm. Next forecast at approx. 9:44 pm.Get WillyWeather+ to remove ads