Europe will be hit by one of largest swells of the decade, as strong winds combined with high tides and large waves are coming in from the Atlantic Ocean.

The United Kingdom and the Republic of Ireland are in state of high alert. A severe storm is already hitting the British Islands, with severe flood warnings being issued across the territory.

The Royal National Lifeboat Institution (RNLI) says people should protect themselves from the swell and keep a distance from piers and coastal defenses.

"They don't understand how dangerous the sea can be. We would say please, please keep away from this water", warns Tom Mansell, a RNLI divisional operations manager and flood rescue team leader.

Cornwall and Mullaghmore Head will get a truly "Black Swell", as the fetch travels without losing energy until Tuesday, 7th January, 2014. Waves in the 48-foot plus range are guaranteed.

Portugal and the Galician region, in Spain, will also be affected by this extreme wave train, between 5th-7th January.

Only professional surfers are expected to hit the big waves during this "Black Swell". If you're a regular surfer, stay away from the ocean otherwise you'll put your life in danger.

Check the Wave Height Forecast for the British Islands and Iberian Peninsula.