Snow and ice are likely to cause travel disruption for most of the UK this week, the Met Office has warned.
A yellow warning has been issued for rain turning to snow across England, Wales, and southern and western Scotland on Tuesday.
The Met Office forecast up to 10cm (4in) of snowfall on high ground, with up to 2cm expected to lie in lower areas.
Police Scotland has issued travel advice telling commuters to plan ahead.
The warnings come after a climber was rescued in the Cairngorms on Sunday.
Forecasters expect a band of rain to push across Wales, northern and western England through the middle of Tuesday, then move eastwards through Tuesday afternoon and evening.
The rain will give way to widespread snow, "possibly heavy at times", across the country overnight.
Up to 2cm of snow is expected to accumulate at low levels, the Met Office said, with the possibility of 5cm to 10cm falling on higher ground.
The snow and ice may cause disruption on the roads, stranded vehicles and cancelled rail and air travel, the Met Office warned.
It said there was a "slight chance" that some rural communities could be cut off and a "small chance" that power cuts may occur and mobile phone coverage could be affected.
Western parts of the country should expect further wintry snow showers on Wednesday morning, it added.
In Northern Ireland, BBC Weather has forecast spells of sleet and snow amid "proper winter weather" - which could lead to possible travel disruption, particularly on Tuesday and Thursday.
For those in Wales, the warning follows a weekend of strong winds which left more than 1,000 homes without power.
Most of the power cuts were in south-west Wales, where gusts of up to 69mph (111km/h) were recorded in Aberporth, Ceredigion.