Devon County Council earlier urged anyone who has to travel through rural areas to get home by 3pm today as an amber warning of heavy snow comes into force.
A weather map suggests parts of Devon, Somerset, Gloucestershire, Dorset and south Wales will be among the most affected.
Weather warnings, forecasts and news concerning the North are the responsibility of the Met Office, which is based in Exeter, Devon.
Further warnings have been issued for most of England and Wales on Thursday and Friday, taking effect from 1pm on Thursday until 9pm on Friday.
There are warnings of disruption on roads, railways and at airports due to icy conditions as temperatures plummet.
Temperatures fell to a staggering -14.4C in Braemar, Scotland, the lowest temperature in the United Kingdom since 2012, when -15.6C was recorded at Holbeach, Lincolnshire on February 11.
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The Met Office said there is a 60 per cent chance of a sleet shower at 6pm which will turn into heavy snow by 10pm.
Southeastern Trains said 21 services were being cancelled or altered on Thursday morning to minimise the impact of ice forming on the rails and ensure lines were clear and that it would run its "winter weather timetable".
Alex Deakin of the Met Office told Express.co.uk: "There is some uncertainty over the progress and the intensity of this snow but it does have potential the potential to cause disruption to the transport network".
Friday will be cold and cloudy with a further possibility of sleet and rain, according to the Met Office.
Burnham-On-Sea will see a minimum temperature of -3°C and a high of just 3°C over the next 24 hours.
It should become drier and maybe brighter by the afternoon, feeling very cold in strong northeasterly winds.