| | See explanatory information at bottom of page.
(1) Valid time/date is the point in time, referenced to Greenwich
Mean Time (GMT), at which the forecast
applies.
(2) 00Z = Midnight GMT = 10 a.m. Sydney Time.
(3) 12Z = Noon GMT = 10 p.m. Sydney Time.
(4) Wave heights are in feet and represent the average of the highest
one-third of the waves present, crest-to- trough.
Maximum wave height likely to be observed over a 10 minute interval will be
approximately 1.6 times higher than the wave heights shown on the charts above.
(5) Wave heights are for deep water and do not include shallow-water
effects. Depending on the steepness of the waves, the slope of the bottom
in the surf zone and the angle of the coastline (or more precisely, the bottom
contours) relative to the incoming waves,
surf can be significantly larger or smaller than the wave heights depicted along
the coastlines above.
(6) These products are most useful for determining the TREND of surf
heights by looking at how the wave heights along the coast are predicted to
change from day to day. That is, they are best for determining whether or
not the surf at your local beach is expected to increase, decrease or stay the
same over the next three days, rather than predicting the actual size of the
surf on a given day at a particular spot.
(7) Arrows represent the direction in which the largest waves are moving;
smaller waves may be present and moving in directions different from those
indicated by the arrows. Note that waves travel along great-circle paths, the shortest
distance between two points on the surface of the globe, not straight lines on
the charts above.
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