"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.
Forecasters are expecting the storm - the third named storm of the year - to bring gusts of up to 80mph in northern Scotland.
Transport networks face widespread disruption and power cuts are possible as a result of the extreme weather, the forecaster said.
But while the Met Office has issued amber weather warnings and a "threat to life" amid flying debris, many have poked fun at the storm damage - or lack thereof - in their area.
Ferry services and trains are cancelled in the north and west of Scotland, while Traffic Scotland warned of disruption on the roads. Severe winds will affect parts of Scotland, but it will generate strong and blustery winds over Ireland also.
"A spell of heavy snow is possible over some central parts of the United Kingdom during Sunday", reports the Met Office.
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The Met Office now has a yellow "be aware" wind warning covering northern Scotland.
Caledonian Sleeper trains suffered major delays after a freight train was hit by metal sheeting blown on to the line near Penrith early yesterday, with passengers arriving in Glasgow, Aberdeen, Inverness and Fort William four hours or more late.
Gusts of up to 110km/h are expected along all coastal areas today ahead of Storm Caroline's passage over the North West and North towards Scotland on Thursday.
Flood alerts were in force last night for Aberdeenshire, Moray, Orkney, Shetland and the Western Isles.
Two to 5 cm of snow is likely in places, with up to 20cm possible over high ground, mainly in Scotland, Northern Ireland and Wales.
Kent is set for an Arctic blast of snow as temperatures plummet, according to the Met Office.