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Fig2.2-3: Wave parameter charts available on ecCharts (see Fig2.2-1and Fig2.12-2 above) and may be displayed by clicking on the desired icon.
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Fig2.2-14(e):The forecast mean wave directions derived from the wind-sea and mean swell (as shown in Fig2.2-14(a)) superimposed on the previous chart (Fig2.2-14(d)). This illustrates the important additional information that is gained from consideration of the wind-sea and mean swell forecasts together. The mean wave directions (Fig2.2-14(a)) give no indication of that a sea passage to the west of Portugal is likely to be through confused rough seas.
Waves and swell with along a long period
Large swell waves with a long period breaking on a beach slope tend to have a large swash with water washed well up the beach. This is often unexpected and takes people by surprise and can cause damage and casualties. Users should note when large waves with a long period are forecast to run onto an exposed coast. Extreme forecast index products for waves can alert users to the potential problem.
Fig2.2-15: Wave energy forecast VT 09UTC 16 Sep 2023, DT 12UTC 15 Sep 2023. The chart shows extreme wave energy flux (~1300KW/m) being driven towards the exposed southern coast of South Africa.
Fig2.2-16: Wave energy forecast VT 09UTC 16 Sep 2023, DT 12UTC 15 Sep 2023. The chart shows the extreme forecast index for significant wave height at 0.9 to 1.0 alerting to the significant nature of the ocean swell.
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