Milford Haven Coastguard says an operation is underway to rescue a Portuguese seaman with serious head injuries in rough seas off the coast of Pembrokeshire.
Warship HMS Echo, which was passing nearby, is trying to provide shelter to calm the water so that the injured man can be winched to safety.
A rescue helicopter from RAF Chivenor and Angle Lifeboat are also involved in the rescue around 18 miles west of St Ann's Head.
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Heavy rain and thunderstorms will affect many parts of Wales this weekend - particularly during Saturday evening.
A paddle steamer has sunk off the north Wales coast while it was being towed towards Northern Ireland.
The heavy rain will ease overnight, with mist and mild temperatures!