The coastguard has launched a search following reports of a person in the water off Porthcawl, in Wales.
The alarm was raised at around 5.55pm on Tuesday, the coastguard said in a statement.
Coastguard rescue teams have been sent from Porthcawl, Port Talbot, and Llantwit Major.
The RNLI launched lifeboats from Mumbles - just before 7pm - and Barry Dock at around 10pm.
The search was suspended in the early hours of Wednesday morning.
The coastguard said the situation will be reviewed at first light and a decision made on whether any further action is required.
Porthcawl is a seaside town on the south coast of Wales, approximately 25 miles west of Cardiff.
Meanwhile, flights have been cancelled and trains suspended as Storm Jocelyn hit the UK.
The severe weather caused major travel disruption and the storm is expected to be at its worst in the early hours of Wednesday.
Eight flights were cancelled at Dublin Airport and four at Glasgow Airport on Tuesday evening, train services in Scotland were suspended from 7pm and drivers were warned to postpone journeys.
Jocelyn arrived shortly after Storm Isha left two people dead and one seriously injured.
Thousands of people are suffering power cuts, while flooding is affecting parts of York.