Heavy rain and melting snow and ice could lead to flooding following Storm Goretti, the Met Office has warned.
Parts of the UK had seen gusts of almost 100mph and a rare red warning in place for “dangerous, stormy” winds in the South West last week.
The Met Office said as temperatures increase, snow melt and a “rapid thaw” across the north of the UK, coupled with further rain, could lead to flooding concerns.
Several alerts for snow and ice, strong winds and heavy rain were in place across the country over the weekend, despite the worst of the storm passing.
Earlier, Met Office meteorologist Tom Morgan said Sunday night would see some “wet and windy weather”.
He said: “Combined with the rainfall, the higher temperatures, we will see some flooding due to the snow melt gradually as we go through the next few days, so that’s the main concern.”
On Monday, highs of around 11C (52F) in England and Wales are expected, and up to 7C in parts of Scotland and Northern Ireland, Mr Morgan added.
As of Sunday evening, 12 flood alerts and eight flood warnings were active on the Scottish Environment Protection Agency (SEPA) website.
SEPA’s flood duty manager David Morgan said flood risk is “greatest in Dumfries and Galloway, and the west and north of Scotland”.
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The Environment Agency had four flood warnings in place, meaning flooding is expected, along with 85 flood alerts where there is a possibility of flooding.
Natural Resources Wales listed six flood alerts.
According to the National Grid’s website, more than 12,000 homes were still without power on Sunday evening following the storm, as National Rail warned of train travel disruption until Monday.
A yellow warning for rain covers northwestern areas of Scotland until 10am on Monday.
Up to 110mm of rain could be possible over parts of Skye, Lochaber, Argyll and the Trossachs, the Met Office said.
A yellow warning for wind is in place until 8am on Monday for northwest Scotland, which could be hit by gusts of up to 85mph.
Forecasters have advised those in regions with alerts to prepare for delayed journeys, flooding and difficult driving conditions.
South East Water (SEW) said on its website that customers in East Grinstead, West Sussex and the surrounding areas have had “no water, intermittent supply or low pressure” from Saturday morning.
The company does not expect the situation to improve until the end of the weekend, according to the website.
It said on Sunday the storm had affected its ability to treat water “at the normal rate” and that burst water mains due to freeze and thaw conditions across Kent and Sussex meant drinking water storage levels were in low supply.
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The company said six major water mains in the Helston area had been “severely damaged” by uprooted trees and this was continuing to affect water supply.
Elsewhere, police said a man in his 50s was found dead in a caravan after a tree fell on to the vehicle in Helston, Cornwall, following the storm.
