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Up to 20cm of snow could submerge parts of the country by Tuesday, according to the latest BBC weather forecast. Temperatures overnight into Sunday plunged as low as -12C in parts of
Scotland. BBC meteorologist Chris Fawkes warned that "we are looking at a really cold day coming up".
Mr Fawkes said: "We do have some rain on the way for us, and that will bring the threat of snow over high ground, particularly in Wales as well as also for Northern Ireland.
He pointed out that temperatures in Scotland last night dropped to -12C in Braemar, while Loch Glascarnoch saw -11C.
The meteorologist told the BBC: "The frost against with us tomorrow morning in the north, while it will be more limited in the south.
"On Monday things will turn rather icy in northern England and Scotland."
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The BBC weather presenter continued: "The air behind this current weather front coming in is a lot milder, so we will see some weather changes over the next few days
"It will be a cold day for most of us, typically around 2C to 3C, but there is milder air nosing into the south-west with temperatures up to 8C in Plymouth."
He warned that Tuesday could see some significant snow chaos, adding: "On Tuesday, we could see some travel disruption over these parts of the country."
"As these weather fronts run into that colder air, across the Pennines and the high ground in Scotland we could see as much as 20cm of snow building in.
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The Met Office has warned that parts of England and Wales are braced for more wintry conditions.
Simon Partridge, a meteorologist, said: “We’ve got this band of rain sleet and snow that’s moving across much of England and Wales through today, that is a real messy mix.”
He added that temperatures will drop as low as -6C overnight in England, with the potential for the mercury to fall to between -10C and -15C in parts of Scotland.
Mr Partridge also warned that the highest areas on Tuesday could get "up to 20cm of snow or so though the course of the day".
He predicted that Trans-Pennine routes in particular could have some issues on Tuesday.
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More than 300 flood warnings also remain in place after waters rose treacherously in several areas across England.
A Met Office warning is in place for snow across much of Wales, threatening travel disruption, power cuts and rural communities being cut off.
On Saturday, two Covid-19 vaccination centres and a test centre were forced to stay shut in Wales after snowfall caused disruption.
Last weekend, four vaccination centres had to shut because of bad weather.
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