Heavy rain and strong winds are starting to hit parts of the UK as Storm Gareth moves east.
Northern Ireland was the first area to be affected and parts of Scotland and north-west England have seen flooding.
Three yellow Met Office weather warnings are in place until Thursday.
Forecasters said winds could reach speeds of 80mph along coasts in northern England later, and there are fears of travel disruption on Wednesday morning.
At Malin Head in the Irish Republic, on Tuesday afternoon gusts reached 80mph while winds were at 62mph at Orlock Head, County Down.
BBC Scotland Weather said winds had reached storm force across Argyll with a gust of 75mph at Machrihanish.
Flooding has already affected many parts of Scotland with alerts in place in southern and western areas of Scotland.
The Environment Agency has issued a number of flood warnings, mostly in north west England.
The Met Office has also warned of localised flooding in Cumbria, after heavy rain.
It added that the storm brings the risk of damage to buildings, flying debris, large waves, power cuts and travel disruption.
The strong winds are expected to move into England and Wales on Wednesday.
Gusts of up to 50-55mph are likely inland and 65mph along western coasts, forecasters say.
The Environment Agency in Yorkshire and the north east of England said rivers will continue to rise, with workers out in Cumbria and Lancashire on Tuesday to try to reduce the risk of flooding.
Gareth is the third storm to be named this year, after Erik in February and Freya earlier this month.
The three yellow “be aware” Met Office warnings in place include:
- Strong winds across Northern Ireland on Tuesday, lasting until 12:00 GMT on Wednesday. Gusts of up to 75mph or even 80mph along northern coasts
- Strong winds across south west Scotland, England and Wales on Tuesday until 15:00 GMT on Wednesday. Gusts of up to 55mph inland and 65mph along the west coast
- Heavy rain in north west England – up to 80mm expected in total, or even up to 100mm in higher ground – from 00:15 GMT on Wednesday until 15:00 GMT on Thursday.
In Wales, the M48 Severn Bridge linking Monmouthshire and south west England has re-opened to all vehicles after it was closed for four hours on Tuesday morning.
Ferry services between Pembroke and Rosslare and Holyhead Dublin are affected.
In Scotland, Scot Rail have restarted the Glasgow Central to Androssan/Largs rail service, after it was replaced with buses due to worsening weather conditions at the Saltcoats sea wall.
The A900 Forth Road Bridge is closed to double decker buses, trailers, motorcyclists, pedestrians and cyclists.
In Northern Ireland, the City of Derry Airport warned passengers to expect disruptions to flights.
P&O ferries said sailings between Dublin and Liverpool have been cancelled because of the weather.
The company has advised Larne to Cairnryan passengers to rearrange travel if they can as “delays/cancellations are likely later”.
Elsewhere, Brittany Ferries from Plymouth to Roscoff, and the returning ferry due to depart on Wednesday, have been cancelled due to weather conditions.
South Western Railway said speed restrictions may be imposed in coastal areas.
A flood warning has been issued for Scarborough, and members of the public have been told to be careful along beaches, coastal footpaths and roads with the risk of large waves and sea spray.
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