Motorists face dangerous driving conditions and schools have been closed as snow brings chaos to parts of the UK.
Two yellow Met Office ice warnings are in place for North West England, South West Scotland, South-central England and Wales until midnight, with Frequent forecasts of sleet, hail and snow.
They warn of disruption to travel, the risk of power outages and patches of sleet on the roads – all of which make driving conditions difficult that have left some cars stranded and forced schools to close.
See the forecast in your area
Sky News weather producer Joanna Robinson said: “Friday will bring more winter showers, some heavy and maybe thundery.
“Snow will continue to accumulate on the hills, particularly in Northern Ireland, West Scotland and North West England – 2 to 5 cm is possible above 100 m and up to 15 cm on the highest ground. “
Grantown Grammar School and Kingussie High School are both closed in Scotland, the former blaming “freezing conditions and lack of gravel on the roads”.
Kingussie High said “dangerous” road conditions were preventing buses from operating.
Both schools said virtual classes would be held instead.
Several schools have delayed their opening until 10 a.m. in South Lanarkshire.
Forecasters warn that snow showers and lightning could disrupt travel and cause power outages.
The prospect of stormy snow – a relatively rare occurrence – is driven by the same conditions that cause thunder in summer, the temperature difference between the ground and the air around it.
Robinson said: “Thunderstorms will remain a risk in the far north west, particularly for the north west of Scotland and Northern Ireland.
“During this time, rain and snow from the more general hills will move to the windy southwest. “
National Highways warned of a “severe weather event” on its website and issued a “severe weather” alert for snow affecting northern England and the West Midlands until 6pm on Friday.
The A66 in northern England is closed with efforts to recover stranded vehicles, according to reports.
Traffic Scotland reported heavy snowfall overnight impacting many routes, including the M77 and M74, and urged drivers to be very careful.
He said several vehicles were stranded on the M8 E / B to J16 exit ramp due to difficult driving conditions, and sand pits were on their way to the scene.
Motorists tweeted images of vehicles stuck in the snow in Glasgow.
Bear North West Trunk Roads said there was snow on roads such as the A82 in the Glencoe and Tyndrum area, the A9 and A83.
Meanwhile, East Dunbartonshire Police tweeted: “There are a number of abandoned vehicles in East Dunbartonshire due to the weather. Stay home if you can and travel later once the weather is over. roads will be a little more clear. “
The coldest night of winter so far
A temperature of -8C (17.6F) was recorded Thursday morning at Topcliffe in North Yorkshire – the lowest in England this winter.
Windy conditions made temperatures colder for many throughout the day as Canadian arctic air swept across the UK.
The Met Office has forecast milder conditions for the weekend.
A period of wet and windy weather is forecast for all parts of the UK on Saturday, with heavy rain likely in most parts.
Sun and scattered showers will replace rain in western areas by the afternoon.
Sunday is expected to be mostly dry with sunny spells in most areas, with some showers forecast for northwestern Scotland and Northern Ireland.
Robinson said: “It will be colder tonight than last. Expect widespread frost in northern, eastern and central Britain, with possible icy expanses. temperatures will rise in the west before the onset of rain.
“Saturday will be milder than recently, with above average temperatures for Wales and much of England. Expect an early high of 10-12C (50-53F) in the southwest and about 6-9C (43-48F) in the north.
“Sunday will see temperatures about a degree or two down Saturday, but it will likely be warmer with more sun and lighter winds. Temperatures will range from 6 to 10C (43-50F).”