Necanicum River Mouth Swell ForecastUnited StatesORClatsop CountyNecanicum River Mouth1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIINecanicum River Mouth swell forecast issued today at 9:45 am. Next forecast at approx. 9:45 am.Get WillyWeather+ to remove ads