Snow showers will affect northern Scotland later on Thursday, while a yellow snow and ice warning is in place for Scotland, Northern Ireland, western England and Wales on Friday.
The weather service has upgraded its warning to amber in northern parts of Scotland, instructing residents to be prepared to deal with extreme conditions.
"Storm Caroline is well on its way across northern parts of the U.K.", Met Office meteorologist John West said.
Severe gales and snow showers have caused travel disruption, school closures and power cuts as Storm Caroline sweeps in to the UK.
A Met Office spokesman said: "Possible travel delays on roads stranding some vehicles and passengers with possible delays and cancellations to rail and air travel".
Forecasting snow showers in the United Kingdom can be quite challenging as conditions are often borderline between rain and snow.
"The greatest impacts are expected to be spray and wave overtopping which could see flooding to low-lying areas and at-risk properties on exposed sections of coastline", said the organisation's duty flood manager Mark McLaughlin.
The U.K.'s national weather service, The Met Office, issued Amber National Severe Weather Warnings from Scotland to northern Ireland.
Winds are forecast to strengthen across parts of Britain on Wednesday ahead of the arrival of Storm Caroline.
The yellow warning is in place for Cos Donegal, Galway, Leitrim, Mayo, Sligo, Clare and Kerry.
"With cold air in place, a spell of snow looks likely to develop on its northern edge".
There may also be short-term power outages.
During Thursday afternoon, a mixture of sleet and snow showers will work their way across the whole of Britain, with the potential for blizzard conditions in Scotland.
By Saturday, the heaviest and most frequent of the snow showers will become more confined to northeast Scotland.