More than 30,000 homes and businesses in Ireland have been left without power as Storm Barra made landfall, with winds predicted to reach 80mph as it crosses east throughout the day.
Heavy rain and sleet was expected on Tuesday as Barra continued its path from the Atlantic. Snow was already falling in the north-west of the country.
The national weather service, Met Éireann, said the storm, which was likely to reach the UK within hours, could pose a danger to life over the next two days.
The UK was also braced for 80mph winds and heavy showers when Barra makes landfall, less than two weeks after Storm Arwen caused significant damage to parts of the country.
Power cuts were reported in Cork, Kerry, Dublin and Limerick and people in three counties on the west coast advised to remain indoors.
Flooding in Cork and Kerry rendered several roads unpassable because of water or fallen trees.