Snow has fallen across many parts of the UK overnight, bringing power cuts, school closures and some travel disruption.
The Met Office said “increasingly frequent” snow showers were affecting parts of Scotland, Northern Ireland and northern England.
Schools are closed across Northern Ireland, Wales and Scotland – where 500 homes remain without power.
The Met Office has yellow “be aware” warnings in place for snow and ice.
An amber “be prepared” warning for snow has also been issued for Sunday.
It said across the UK, 2-5cm (1-2in) of snow was likely, with up to 20cm possible in northern Scotland, Northern Ireland, north Wales and the Midlands.
“The heaviest and most frequent snow showers will progressively become confined to north-east Scotland during Saturday,” it said.
It comes after Storm Caroline brought winds gusting more than 90mph on Thursday, disrupting rail and ferry travel and shutting dozens of schools in Scotland.
Disruption continuing on Friday includes:
- Hundreds of homes in Shetland, Orkney and Caithness in Scotland are still without power and all schools are closed in Orkney and Shetland
- Passengers had to spend a night on board the Orkney ferry Hamnavoe after it was unable to berth in Stromness
- Schools are closed on the Isle of Man, where bus services are suspended and people have been advised to only go to the hospital in an emergency
- Up to 20cm of snow is expected in Northern Ireland and the Rathlin ferry service has also been cancelled
- Snowfall has forced more than 50 schools to shut in Wales and roads have closed due to icy condition
BBC weather presenter Louise Lear said although the storm-force winds had eased, conditions would remain blustery and cold on Friday – with temperatures ranging from -2C to 3C (28F-38F).
Freezing temperatures are expected to continue on Saturday.
About 8cm (3in) of snow has already fallen in Aviemore, in the Highlands, while parts of Northern Ireland, Wales and areas to the west of the Pennines have also seen a covering.
Pictures of the snow showers were shared overnight on social media.
The Met Office earlier warned that some rural communities could be cut off and said there could be “possible delays and cancellations to rail and air travel”.
It said Storm Caroline’s winds were now confined to the far north-east of mainland Scotland and the Northern Isles, and there could be gusts of 70-80mph at times, especially over Shetland, on Friday.
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