West Cornwall - Biggest swell of the winter

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West Cornwall - Biggest swell of the winter

Postby Graham Easterling » 2015 Feb 24, 11:59

The recent long run of strong to gale westerly winds across virtually the full width of the north Atlantic has resulted in the biggest swell of the winter in west Cornwall. The swell peaking at 26' just off Land's End. (Pic of conditions at Cape Cornwall http://www.cornishman.co.uk/images/loca ... 546158.jpg ) . This, combined with a period of around 12 seconds, made it fairly powerful, though nothing out of the ordinary. There has been a lack of very large swells (as opposed to rough seas) this winter. A swell of this size (say 8m) has a return period of approx 4 months. An 11m swell has a return period of 5 years.

Last winter the largest swells were around 11m, it was the very long period due to the exceptionally persistent long fetch that made the waves so powerful.

The largest waves in recent times being on 10th March 2008, that was scary! http://www.sennen-cove.com/10march08.htm

The big sea means that visibility is far less than the 'excellent' forecast, sadly the 5 day visibility forecasts take no account of salt spray, a persistent feature across west Cornwall at this time of year.

Penzance Weather Station
Grid Ref:
SW464231 - Post Code: TR18 4TP
19m AMSL - Aspect SSE
In a SE - NW orientated valley

23 Years of Penzance Weather Records : http://penzanceweather.atspace.com/weather.html
Graham Easterling
Posts: 316
Joined: 2011 Nov 30, 20:29
Location: Penzance, Cornwall

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