"But where there is snow lying it could be heading towards double minus figures, -8 or -10C especially in towns and cities, and probably in the north of England and Scotland".
The Scottish Government Resilience Team met this afternoon to discuss preparations and warned of "difficult driving conditions" ahead.
"By Thursday and/or Friday, I think most places will stand risk of seeing something a bit wintry - sleet or snow".
Snowfall could lead to unsafe road conditions, warned the Met Office, as severe weather warnings for wind and snow were issued for Scotland, the North of England and Northern Ireland.
Thunder and lightening this evening could disrupt the power supply and bring so-called "thundersnow" to some areas, he said.
On Thursday, ice and hail threaten further problems, and trains could be affected.
Gusts of up to 60mph could hit Carlisle, with up to 75mph predicted on high ground.
The latest severe cold warning comes into force across England at 3pm today and warns that there could be "heavy snow" in the south on Thursday.
Travel disruption is likely to include traffic restrictions on major bridges.
The chief forecaster has added: 'The strongest winds will affect some of the higher level roads, for instance those over the Pennines and the Southern Uplands.
Around 2cm of snow could settle in low-lying areas, while up to 10cm may fall on high ground.
The wind chill map above shows that it could feel as cold as minus 7C in the south during the morning rush hour on Friday morning.
Snow from thunder and lightning could be set to strike as an Arctic blast from Canada is forecast to take hold across the United Kingdom this week.
The Met Office say that from Tuesday the colder weather will arrive.
We will keep you updated. There could be disruption to public transport.
Take food, water, blankets, a torch, a first aid kit, a fully charged phone, a shovel, jump leads and de-icer fluid.