The Met Office has issued yellow warnings for rain as Storm Aiden is set to batter Britain this weekend.
Heavy rain and strong winds will sweep across the country, with risks of flooding and travel disruption.
Met Éireann, the national weather service in Ireland, named Storm Aiden on Friday due to strong winds and heavy rain.
All parts of the UK will get wet weather this weekend, with western and hilly areas in line to receive the biggest drenching as Storm Aiden moves in from the West, according to the Met Office.
It comes after an unsettled week that saw a mixture of wet and windy weather across the country.
Met Office Chief Meteorologist Frank Saunders said: “Several yellow rain and warnings are in place from Saturday until Monday, covering western parts of the UK.”
The yellow warnings – which came into force at midnight – cover Northern Ireland, much of Scotland, Wales and parts of western England.
The Met Office has also warned of the possibility of flooding on roads, flooding of some homes and businesses, interruption to some power supplies, as well as bus and train delays.
Met Office deputy chief meteorologist Martin Young said: “As the heavy rain and strong winds from Storm Aiden sweeps eastwards on Saturday, another system quickly follows on Sunday that contains the remnants of ex-Hurricane Zeta, bringing further heavy rain and strong winds.
“Given that this is falling on already saturated ground from what has been a wet October, there is an increased risk of flooding in some warnings areas.
“We’re urging people to keep a close eye on the forecast, flood alerts and warnings in their areas.”
The warning lasting through Saturday expects bouts of heavy rain to hit southern, central and western Scotland through the weekend and bring a risk of flooding.
It also covers parts of Wales, north-west England and Yorkshire and Humber.
Predicted rainfall throughout Saturday is expected to be 20-40mm in lower-lying areas, while hilly areas could see 40-60mm, the Met Office said.
Another yellow warning for rain covering Wales and north-west England is in force from 6pm on Sunday to 6am on Monday, and warns some communities could be cut off by fast flowing and deep floodwater.
Very strong winds could affect north-west Scotland between noon and 9pm on Sunday, including the possibilities of power cuts and delays for high-sided vehicles and public transport.
Gary White, the duty tactical manager for Natural Resources Wales, said flooding is likely up and down the country over the next few days.
He said: “Our emergency response workers will be at key sites checking defences are in good working order and making sure any drainage grids and screens are clear to reduce the risk to people and their homes.”
UK 5 day weather forecast
Cloud and rain, heavy at times, moving eastwards across the UK, brighter weather and a few showers following later. Heaviest rain in the west with a new batch of rain into western Scotland later. Windy, especially in the northwest later.
Wet and blustery across parts of Scotland at first this evening, but briefly improving later. A further dose of wet weather then spreads eastwards into the UK overnight.
Early rain in the north soon clearing to brighter weather and showers before rain returns later. In the south, mild with spells of rain. Windy, especially far northwest Scotland.
Outlook for Monday to Wednesday:
Rain clears from the southeast on Monday morning, cool and breezy conditions then follow with showers being most frequent across the western areas. Becoming largely dry and settled on Wednesday.