Taking the tip of Cornwall as an example, the peak swell forecast for Sennen is just 10', which typically occurs several times in a normal September, twice that height occurs several times a year, and last winter exceed 30' on several occasions.

Correction, latest forecast just 8', which is of no significance whatsoever and is exceeded on the large majority of months. It's forecast to be 10-12' on Tuesday, due to the persistent run of strong westerlies.

Off Land's a swell height of around 45' (well 13m - you convert it) has a 5 year return period. (Thanks Norman!)


Graham
Penzance