Northern Ireland's north coast has been battered by severe gales and large waves and the public has been warned to stay away from beaches in the area.
Earlier, the Met Office issued an amber weather warning, particularly for counties Antrim and Londonderry, advising of "dangerous conditions".
So far, the highest wind speed of 64mph has been recorded at Magilligan Point.
Police said Benone beach, Magilligan, has been closed as it is "dangerous to the public" due to the adverse weather.
Officers warned of "high winds, water surges and debris" in the area and said motorists "should heed the closed signs and not venture onto the beach as it is unsafe".
The National Trust, which runs the nearby beach at Portstewart, warned members of the public they were risking their lives by going into the sea in a storm.
On its Portstewart Strand Twitter account, the trust said: "We can not stress this enough. Please stay away from the beach. Just witnessed a second person get washed away and only just escape to safety."
The coastguard said they had a report of a man going into the water at Portstewart fully clothed and wearing a rucksack.
However, he came out of the water uninjured.
In the Republic of Ireland, wind speeds of 76 mph have been recorded at Malin Head.
Northern Ireland Electricity (NIE) has warned of possible damage to the electricity network and its emergency repair crews have been on standby.
Travel is also being affected with a number of sailings delayed or cancelled.
The Met Office said: "Westerly winds will gust 70 to 80 mph at times and will be combined with exceptionally high waves.
"The public should be prepared for dangerous conditions, especially along causeways and coastal roads exposed to the west."
A yellow weather warning is in place for the rest of Northern Ireland.
Meanwhile, Met Éireann has issued a status orange wind warning - its second highest category of alert - for all coastal counties including and between Donegal and Clare.
The electricity service said exposed northern locations were especially vulnerable.
In Northern Ireland, NIE customers are advised if they do lose electricity supplies they should contact the NIE customer helpline on 03457 643 643 or report the fault online at nie.co.uk.
Customers can also follow NIE on Twitter @NIElectricity for regular updates.