An “apocalyptic” storm will batter the Westcountry rivalling the atrocious conditions at the start of the month.
Yellow warnings for weather featuring heavy rain and high wind have been put in place by the Met Office for Friday, Saturday and Sunday.
The fact that the storm will coincide with high spring tides means many waves could overtop harbours.
Surf forecast site magicseaweed has called the storm Hercules Take Two - a sequel of the storm that battered the coast at the start of this month - and have said it will be as damaging, dangerous and "similarly apocalyptic".
Latest forecasts suggest that a cyclonic weather front travelling south-east across the Atlantic will hit the county on Saturday.
At it’s height the storm, which has been dubbed “Hercules Take Two”, “Hercules the Sequel” and “Storm Brigid”, after a patron saint of Ireland, is predicted to produce 30ft waves which will batter the coast.
They said the storm began life in the Gulf of Mexico before travelling across the Atlantic where it has strengthened and deepened before turning towards the Bay of Biscay - meaning it will batter the south west coast.
A spokesman said: "We see exceptional swell coupled with moderate to gale force westerly winds across Atlantic facing European coasts.
"For the United Kingdom there are, again, legitimate reasons for concern."
The site forecasts waves of 30ft hitting every 19 seconds at the peak of the storm.
A spokesman for the Met Office said: "A further area of heavy rain will spread eastwards across the UK on Friday, clearing the southeast of England during the early hours of Saturday.
"20-30 mm of rain will fall quite widely, with around 40 mm on some high ground in the southwest of England and south Wales. The heavy rain will be accompanied by strong to gale force winds.
"The public should be aware of possible disruption, primarily due to further flooding, chiefly in areas already, or recently, affected."
They added: "Winds will increase on Saturday, with gusts widely to around 50-60 mph, and perhaps to around 70 mph in exposed parts of the north.
"Additionally large waves could overtop coastlines. The public should be aware of these hazards."
The storm is being carried on a cyclonic weather front now travelling south-east.
Coastal towns and villages are again preparing sandbags to protect flood-risk properties.
Local businesses such as the Watering Hole in Perranporth is warning followers about the upcoming weather on Twitter.
Falmouth coastguard has advised people to keep off harbour rocks and walls and avoid any unnecessary risks.