There are also warnings that visibility will fall below 100 metres in places.
Mr Wilson said: "There is a lot of radiation fog around at the moment".
Up to four inches could fall over those two days, with forecasters warning of blizzards and frequent lightning strikes, which could cause power cuts and mass travel disruption.
Met Éireann are maintaining their status orange fog warning for Ireland throughout tonight until 2pm Friday.
The warning covers Northern Ireland, Wales, north-west England, south-east England, West Midlands, Yorkshire and Humber and south-east England.
Temperatures are expected to remain low climbing no higher than 4C in the northwest but slightly warmer temperatures of 7C in London and the southeast.
Heavy snow showers and hail to affect north of Scotland communities
Despite a switch to a more westerly airflow it will feel cold especially across the north where the odd flake of snow is possible, according to Exacta Weather's James Madden.
"Now we have ideal conditions for widespread fog across the country, particularly, for some southern areas, where it could linger for some lengthy periods from tonight".
"This reduces the ability of the air to hold moisture, allowing condensation and fog to occur".
Where is radiation fog in the United Kingdom?
WeatherOnline forecaster Simon Keeling added: "Further spells of drizzle here expected for the far northeast of Scotland tonight".
Thick fog will also cause travel chaos across the United Kingdom as commuters will face hard driving conditions and flight delays today.