This
is part
of an article that appeared on Swell.com 11/22/2000, but they keep
changing
their locations so I put the chart here. The last time I looked, the
full
article was found here.
It's an interesting read, about how George Downing and Peter Cole came
up with a mathematical formula to compute "Hawaiian Scale" wave heights
based on the wave heights & period readings from the NW Hawaii
Buoy.
I have found it to be extremely accurate (up to the range that I surf,
anyway).
Wave
Height__Swell Interval___Hawaiian Scale
5_______________10________________3
feet
7_______________10______________4.2
feet
9_______________10______________5.4
feet
5_______________14______________4.2
feet
8_______________14______________6.7 feet (round off to 6)
10______________14______________8.4
feet
11______________14______________9.2 feet (round off to 8)
13______________14_______________11 feet (round off to 10)
14______________14_____________11.8 feet (round off to 12)
7_______________17______________7.1 feet (round off to 6)
8_______________17______________8.1
feet
10______________17_____________10.2
feet
13______________17_____________13.2 feet (round off to12)
15______________17_____________15.3
feet
17______________17_____________17.3 feet (round off to 15)
20______________17_____________20.4
feet
8_______________20______________9.6 feet (round off to 8)
10______________20_______________12
feet
12______________20_____________14.4 feet (round off to 12)
14______________20_____________16.8 feet (round off to 15)
15______________20_______________18 feet
17______________20_____________20.4 feet
20______________20_______________25 feet
25______________20_______________You're f---ed
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