Forecasters said snow showers would continue to affect parts of Scotland, Northern Ireland, Wales, northern England and the Midlands, with the potential for up to 20cm (8in) of snow over the course of today.
Stay with us for the latest updates.
The Highlands, Northern Ireland and Wales woke to wintry scenes on Friday, with ongoing snowfall in many parts of Britain causing power cuts, school closures, and travel disruption.
Meanwhile, dozens of workers are being removed from a North Sea platform due to safety fears over weather conditions caused by Storm Caroline.
"During Friday, increasingly frequent snow showers already affecting parts of Scotland, Northern Ireland and northern England will extend across many other northern and western parts of the United Kingdom", said the Met Office.
Snow showers could continue until Monday - with a spell of "heavy snow" possible over some central parts of the United Kingdom during Sunday.
Highways officials have reported "hazardous" driving conditions and police in Shropshire in the West Midlands advised against driving unless "absolutely necessary".
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The storm is now sweeping across the UK's northern-most regions.
The Met Office warns that Storm Caroline poses a "danger to life" in Britain.
The strong wind warning is valid from 6am until 11.55pm on Thursday, with an amber warning for northern Scotland. More broadly across Scotland there will be 60-70mph gusts, but in exposed areas we could see 90mph'. Outside of the snow showers, there will be bright sunshine.
The Forth Road Bridge connecting Edinburgh with Fife and Tay Road Bridge connecting Fife and Dundee are closed to double-decker buses, with the Skye and Kessock bridges shut to high-sided vehicles.
Friday will also be cold, Met Éireann said, with sunshine and scattered rain, hail, sleet and snow showers, and temperatures of 3 to 6 degrees in gusty northwesterly winds.
Scotland's transport minister, Humza Yousaf, said: "With stormy weather expected across the north of Scotland we would urge people to check with their operators before they travel, especially if they are planning a ferry journey".
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