The Met Office says across the United Kingdom, 2-5 cm (1-2 inches) of snow is likely in the other affected areas, with 10-20 cm possible in some locations, mainly in northern Scotland, Northern Ireland, and possibly the north-west Midlands. Cloudier than recent days, with some snow possible in the south.
One Twitter user wrote: Storm Caroline approaching, danger to life, take care our snowman has already been blown over and injured? Broadly speaking we're looking at 2cm to 5cm, but in more exposed areas we could see 10cm to 20cm.
The authority issued a yellow warning for snow from 4am today until 11.55pm, with parts of Norfolk, Suffolk and Essex expected to see some of the white stuff.
Freezing temperatures are expected to cause further disruption across swathes of the United Kingdom and could leave some rural communities cut off, forecasters are warning.
Forecasting maps show that between three and five inches could fall in Wales and the West Midlands over the weekend.
Caroline, the third named storm of the year, is also expected to cause power cuts and bring large waves to coastal routes, seafronts and coastal communities in northern Scotland.
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Forecasters warned that the snow would become more widespread throughout the day.
Heaviest snow showers will be confined to northeast Scotland as Saturday draws to a close.
"Significant accumulations" in Wales and the West Midlands are also expected, says the Met Office, which has put Wolves' Sky Bet Championship game against Sunderland in doubt, with staff and fan volunteers welcomed in to help clear the stadium of snowfall. "Possible travel delays on roads".
A snow and ice warning is in place for Friday for Scotland, Northern Ireland, western England and Wales.
'At the moment we have a yellow weather warning in place, but it could be upgraded to amber'. Road, rail, air and ferry services may be affected, with longer journey times and cancellations possible.
Train services in the north and west of the country have been cancelled, while Traffic Scotland is warning of potential disruptions on the road.