Trwyn Llech-y-doll Swell ForecastUnited KingdomWLGwyneddTrwyn Llech-y-doll1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIITrwyn Llech-y-doll swell forecast issued today at 5:49 am. Next forecast at approx. 5:49 am.Get WillyWeather+ to remove ads