Up to 10cm of snow will blanket the UK as a brutal winter storm sweeps across the country .
The heaviest snow – 5-10C – is expected over higher ground, although accumulations of 1-3cm are likely "quite widely" at lower levels, the Met Office says.
Snow and ice warnings have been issued for most of the country, with forecasters warning that villages could be cut off and roads could become impassable in the worst-hit places.
Snow and wintry showers will be followed by dangerous ice as temperatures drop.
The latest snow maps reveal when and where Britain will be blanketed by snow on Tuesday as the system moves southeastwards through the day.
There are three separate yellow warnings for snow and ice for western Scotland and all of England and Wales.
The timings vary, and forecasters have warned that predicting snow is a difficult task and some places under a warning may not see any or very little at all.
The snow and ice warnings cover:
Scotland and into northwest England until 12pm on Tuesday.
Central regions, Wales and the northeast between 12pm on Tuesday and 11am on Wednesday.
Northern Ireland and much of Scotland from 3pm on Tuesday to 11am on Wednesday.
The southeast, East Anglia and London from 9pm on Tuesday until 12pm on Wednesday.
Here are the latest snow risk maps from Netweather.tv.
Snow, sleet and rain began falling over parts of Northern Ireland, Scotland and northern England overnight, forcing roads to close in Cumbria and schools to shut in the Highlands as the conditions worsened.
The A6 was closed between Shap and Kendal in Cumbria, and "treacherous" blizzard-like conditions were reported on the M6.
North Wales was also seeing heavy snow.
A yellow warning for snow and ice will end for parts of western Scotland at midday, but the threat of ice and further snowfall or wintry showers remains and a new warning will begin at 3pm.
The system will continue to move southeastwards through Wales and central parts of England.
Heavy snow will move into central areas, especially over higher ground, in the afternoon.
The conditions threaten to cause problems for the afternoon commute.
A new snow and ice warning will begin for Northern Ireland and western and southern parts of Scotland.
By this time heavy snow will be blanketing parts of Wales as the system continues to churn towards London and the southeast of England.
Driving conditions will become hazardous and ice could form on surfaces as temperatures begin to drop.
A yellow warning for snow and ice is in place for the southeast from 9pm, with anywhere from 1-10cm expected through the evening.
By then, the heaviest snow will have cleared from western regions.
Marco Petagna from the Met Office said London could see snow showers – but added they were unlikely to settle.
Most people will be snug in their beds as heavy snow falls over the south east overnight.
It will take some time for the system to clear.
Temperatures will be very cold across the country overnight, with -10C possible in the Highlands of Scotland and -4C in the south.
Some places will continue to see wintry showers.
Ice will be a problem in many places.
There is a risk of further disruptive snow and ice to parts of the UK on Thursday and Friday.
Met Office five-day weather forecast
Sunny spells and wintry showers will continue across northwestern areas.
A band of rain, sleet and snow will move east across Wales and England through the day with accumulations in some places, particularly over high ground.
Wintry showers following.
A band of sleet and snow will gradually clear southeast England.
Clear spells elsewhere with scattered wintry showers, mainly in the west.
A widespread frost and turning icy in places.
A cold start with icy patches for some.
Sunny spells and wintry showers will continue, mainly in the north and west.
Breezy in the southwest at first.
Thursday to Saturday
Staying cold with sunny spells, wintry showers and a risk of ice.
A band of rain and snow could move into England and Wales during Thursday and into Friday.
Surviving the cold weather
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