Phenomenal waves more than 40ft high are expected to hit Cornwall this weekend.
Surf website www.magicseaweed.com said waves of up to 42ft could slam into the coast on Saturday.
A severe depression is crossing the Atlantic and Cornwall is expected to take the brunt of the storm with devastating results.
The extreme weather this winter has caused massive problems for coastal communities, some of which have been repeatedly flooded.
The waves hitting Cornwall are expected to be biggest in the far west at Sennen.
But relatively sheltered areas such as Falmouth could also be hit by waves of almost 30ft - the height of an average house - according to Magic Seaweed.
The Cribbar off the coast at Newquay can generate waves of more than 30ft but waves of more than 40ft are very rarely seen in Cornwall.
The surf forecast website www.stormsurf.com said Cornwall will see the biggest waves in the world tomorrow with waves of up to 38ft.
A Met Office spokesman said: “There is another deep low moving north west. On Saturday itself we are expecting gales and possibly severe gales in exposed south western areas as well.
“There is rain overnight into Saturday and that will be followed by scattered heavy showers.”
The Met Office said the wild weather showed no signs of abating with more unsettled weather into the beginning of next week.
Flood alerts are in place across the county from the Environment Agency but no flood warnings have yet been issued.