Exceptional Swells on the way

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Exceptional Swells on the way

Postby Graham Easterling » 2014 Jan 02, 20:00

Currently all sorts of warnings out for the SW coast as a large swell (>30ft forecast for Sennen and some other west Cornwall beaches) combines wih the biggest Spring tides of 2013 (unusually far from the equinox) and low pressure.

However, looking at the forecast maps for the weekend, it seems to me there will be something bigger (swell wise) heading for Cornwall Monday. Instead of dashing across the Atlantic, a very large, intense low is sitting around. A view supported by Magic Seaweed. http://magicseaweed.com/UK-Ireland-MSW-Surf-Charts/1/ (run the animation through to late Sunday) . Also the wave period is expected to be 20 secs or so as the big swell arrives (the longest period waves travel fastest), the tip of Cornwall seeing the longest wave period. These waves will be very powerful, with some very large wave set up surges likely.

It has been the sea state, rather than the wind or rain, that has been of particular note down here. We've already seen several days with swells > 20' at Sevenstones (highest 29' on the 27th if I remember rightly) but Monday could see the largest swell since 10 March 2008.
It's got to go some to beat that though http://www.sennen-cove.com/10march08.htm

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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