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Old December 31st 17, 01:04 PM posted to uk.sci.weather
Norman Lynagh[_4_] Norman Lynagh[_4_] is offline
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Default [OT] Powerful swell at Cape Verde

These waves were videoed a few days ago at Cape Verde. It shows the
power of long-period waves even though the height is relatively modest.
I make the period something like 13-15 seconds

https://twitter.com/twitter/statuses/947449527065305088

--
Norman Lynagh
Tideswell, Derbyshire
303m a.s.l.
https://peakdistrictweather.org
Twitter: @TideswellWeathr