Emergency services have urged the public to be aware of the dangers posed by strong winds due to strike the UK in the wake of Storm Ellen.
Gusts of up to 70mph could hit coastal areas on Thursday and Friday, which when combined with high spring tides may trigger large waves and flooding.
Britain dodged the worst of Storm Ellen's impact on Wednesday, but the Met Office is warning of another low pressure system bringing powerful winds that could cause disruption to travel and power supplies.
Strong and sudden gusts of wind are expected tonight, particularly in squally showers 🌬️
40-50 mph possible inland50-60 mph coasts and hills
Warnings are in force
— Met Office (@metoffice) August 20, 2020
Nearly 194,000 homes and businesses were hit by power cuts and roads were blocked with fallen trees as Ireland bore the brunt of Storm Ellen this week.
Despite the storm moving on, a yellow weather warning running from 8pm on Thursday to 4am on Friday predicts further strong winds will hit much of Northern Ireland and the western coast of Britain, bringing potential disruption to travel and power supplies.
Another yellow warning for strong winds is in place for England, Wales, and parts of Scotland from 4am until 6pm on Friday.
Met Office meteorologist Matthew Box said: "Thursday's warning in the west is for some very strong winds in that area associated with the low pressure that's moving north-eastwards.
"There's going to be some squally heavy rain, chance of some thunder, widely 40 to 50mph gusts inland in the warning area."
He added that 70mph gusts could possibly hit coastal areas, with the strongest winds expected in the south-west of England and west of Wales in the earlier hours of Friday.
The South West coast is set for a bit of a battering over the next couple of days, with dangerous sea conditions involving large swells, strong winds & spring tides expected 🌊🌬️🌊
— HM Coastguard (@HMCoastguard) August 20, 2020
Mr Box added: "As that low continues to move north-eastwards during Friday day time it's going to bring a swathe of stronger winds across much of the UK.
"That's when we'll see widely gusts inland to 45, 50mph, with gusts of 60mph around coasts and hills."
The Environment Agency has issued 42 flood alerts and 19 flood warnings – which urge people to take immediate action – largely along the south and south-west coastline of England.
They warn that a combination of high spring tides, strong winds and large waves are expected to cause property flooding on Thursday night or Friday morning.
The agency warned people in the south-west to not "wave watch" and "stay away from sea promenades and exposed coastal areas", with tidal gates being closed on Cornwall's south coast.
Natural Resources Wales has also issued seven flood warnings for the south west coast of the country.
Devon and Cornwall Police have warned the public to be wary of "storm conditions" across their region, particularly on the coast where waves could reach up to nine feet high.
#StormEllen is coming to the South West #coast. Strong 🌊 and high winds can sweep you into the sea. Don't wave watch, stay away from sea promenades and exposed coastal areas and know your #flood risk https://t.co/QdPKdEYx15pic.twitter.com/niJlPYcooE
— Environment AgencySW (@EnvAgencySW) August 20, 2020
The force said strong winds could bring "dangerous seas and strong rip currents" and urged beachgoers to check tide times, stick to life-guarded beaches, be aware watersports may be unsafe and avoid storm watching.
Chief Inspector Tom Cunningham said: "We are aware there is many thousands of tourists in our coastal communities currently who may not have experienced conditions which we are expecting or be aware of the danger they can bring.
"We would ask everyone to heed the advice of the RNLI and HM Coastguard by not putting themselves, and indeed emergency responders, at risk by entering dangerous waters.
"Beaches are a huge draw to tourists in our region, but our coast needs to be respected by all."
HM Coastguard urged people to take extra care during the windy weather, adding on Twitter: "The South West coast is set for a bit of a battering over the next couple of days, with dangerous sea conditions involving large swells, strong winds & spring tides expected."