Temperatures will plummet tonight as rain, sleet and up to eight inches of snow batter the UK and make last weekend's warmer weather a distant memory.
Mountain ranges across the UK are expected to be worst hit, with snowfall set to accumulate tomorrow morning in the Highlands amid -6C temperatures.
But snow is also forecast for higher ground in England and Wales.
Weathermen have predicted snowfall in the Peak District, the Pennines and the Cumbrian Fells in the Lake District over tomorrow night and into Wednesday.
Snowdonia in Wales as well as the Cairngorms and Southern Uplands in Scotland are also likely to see snow.
A Met Office yellow icy weather warning in place for Scotland and parts of northern England is likely to be extended amid concern over potential "hazardous" conditions.
Tuesday could also be treacherous as Brits wake up to a frosty start across the country, after a freezing night across the UK.
Most of the country will become slightly warmer tomorrow, though Scotland will remain icy with temperatures plummeting further to -8C.
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John Hammond, chief meteorologist for Weathertrending, told The Sun Online: "For the rest of Monday and Tuesday, the hills and mountains of western Scotland and Northern Ireland are likely to see some ‘wintry’ showers.
"Some sleet is possible down to low levels, but it’s the higher elevations that will see most of any snowfall – mostly above where people live.
"However the higher level routes in the Highlands may see some accumulating snowfall, with ice being a more widespread hazard, especially on Tuesday morning."
He added: "In fact most of the UK will have a crunchy start to Tuesday morning, with a widespread frost across the UK.
"On Tuesday, rain will be arriving across the southwest of the UK. As it hits the cold air further north, a period of snow is likely for the hills of mid and north Wales; and by Wednesday morning the risk extends to the Peak District, the Pennines, the Cumbrian Fells and the southern Uplands.
"2-5cm is possible to affect the highest communities in these areas, but some of the mountain passes could briefly see as much as 10-15cm."
The Met Office has predicted up to 20cm of snowfall in the Pennines tomorrow overnight, as temperatures drop below freezing.
Cold with sunny spells and a few showers in the north. A spell of rain, some heavy, will quickly move east across Wales and central parts of England, with some heavy showers to the south. Breezy and mild in south.
Further showers are likely across some northern and western parts overnight, mainly on coasts and hills. Clear spells elsewhere, leading to a fairly widespread frost. Some fog patches are possible.
A cold, bright and frosty start, with some fog patches. Further showers in the north, mainly on coasts. Cloud increasing from the southwest, with persistent rain arriving later.
Outlook for Wednesday to Friday:
Rain moving east across England and Wales on Wednesday, with some snow possible on northern hills. Further spells of wet and very windy weather are likely later in the week.
Source: Met Office
Brian Gaze, director and meteorologist for The Weather Outlook, also predicted snow in some parts of the UK.
He told The Sun Online: "Tomorrow night and through Wednesday heavy rain spreads northeastwards and it probably turns to snow for a time over Snowdonia and over the hills in northern England.
"Higher parts of the Pennines could see several cms of snow."
This article contains public sector information licensed under the Open Government Licence v1.0
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