Holm of Helliness Swell ForecastUnited KingdomOSShetland IslandsHolm of Helliness1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIIHolm of Helliness swell forecast issued today at 12:49 pm. Next forecast at approx. 12:49 pm. Wave Height Sea TemperatureGet WillyWeather+ to remove ads