© Provided by Independent Digital News & Media Limited
Storm Callum cut power to thousands of homes and caused the cancellation of dozens of flights as it hit the British Isles overnight.
Forecasters have warned of more power cuts and travel chaos on Friday, as the storm brings torrential rain and gale force winds of up to 70mph.
The Met Office has issued a 36-hour amber warning across south Wales, while yellow warnings for heavy rain are in place across much of the country.
The weather service said it was "likely" some homes in south Wales would experience flooding, and there was a "good chance" some communities would be cut off by flooded roads.
Some parts of Wales could see up to 160mm of rain - almost two months' worth - over the next two days.
A yellow warning has been issued for strong winds in Northern Ireland, where gusts of up 60mph are expected on Friday morning.
Dozens of flights at Belfast City airport have been cancelled, and ferry crossings for Wales to Ireland are also expected to be hit by the wild weather. Northern Ireland's Translink rail service warned of delays and said trains would be subject to speed restrictions on Friday.
More than 900 homes and businesses in County Antrim have been left without electricity, according to Northern Ireland Electricity (NIE).
Power problems in the Republic of Ireland are even more extensive. Around 20,000 properties were impacted during the night, with counties Cork, Kerry and Donegal among the worst hit.
Western Power Distribution said electricity had been disrupted at more than 950 homes across south west England.
Northern and western parts of the UK will be the worst hit by the wet weather brought by Storm Callum on Friday, and prolonged rain is also forecast for Saturday.
"The wind gust will approach 40 to 50mph across western parts of Scotland, across Wales, western England and Northern Ireland," said Met Office forecaster Aidan McGivern.
"Big waves are a risk," said McGivern. "We could see coastal impacts from those and inland impacts from those strong winds as well."
The meteorologist warned exposed coastal areas in Northern Ireland could see 60mph gusts, while winds in some parts of coastal Scotland could reach 70mph later on Friday.
Although the strong winds are set to die down on Sunday, the wet weather is set to continue across much of the UK over the weekend.
Only the south east of England is expected to enjoy a break from the rain on Saturday, when a bright spell in the region could see temperatures reach 24C. © Provided by Independent Digital News & Media Limited