"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.
In London the predictions are that there will be two inches of snow at around 6pm on Monday.
Severe weather warnings for powerful winds, hazardous ice, downpours and heavy snow have been put in place by the Met Office until midnight on Sunday.
Devon's gritters will be out in force this evening and overnight with the possibility of snow showers and icy conditions forecast.
Weather warnings have been issued as parts of the United Kingdom are braced for winds of up to 90mph, causing potential danger to life, with the arrival of Storm Caroline.
Across the United Kingdom, conditions will start to turn wet and blustery overnight, especially across the North and North West, with strong winds expected early on Thursday.
As snow showers spread throughout the day, Storm Caroline is expected to get worse before it gets better. The overnight temperature in Glasgow is expected to fall to -5C (23F) on Saturday night.
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'At the moment we have a yellow weather warning in place, but it could be upgraded to amber'.
"Large waves are expected and beach material may be thrown onto coastal roads, sea fronts and properties".
A spokesman for CNR International said: 'CNR International has been carrying out remedial work on the platform's jacket structure and assurance activities are ongoing to confirm their effectiveness.
Road, rail, air and ferry services may be affected, while a loss of power in some areas is also possible.
The storm is also expected to bring to an end the mild weather seen in recent days, with plummeting temperatures, snow and blizzard conditions forecast for parts of Britain later this week.
"Devon's army of Snow Warden volunteers should be aware of the potential for some snow to lay on higher ground over the next 36 hours, but should also be prepared for a period of cold weather with the potential for ice and possibly further snow at times".