9-band bar plot
Wave energy and mean wave direction are resolved to 9 bands (2-6,6-8,8-10,10-12,12-14,14-16,16-18,18-22,22+ seconds). The component wave energy is converted to a wave height and plotted as vertical bars. Below, wave direction is plotted as arrows pointing towards incoming waves. Arrows point straight up for waves coming from the north. If a station does not have wave direction, all the arrows will point down.
Please note that the plotted wave energy bars have varying confidence limits due to the fact the statistical uncertainty depends on frequency bandwidth rather than period bandwidth.