Fog with very poor visibility will linger in many inland areas this afternoon and will get worse as the day goes on, Met Eireann have warned.
It will be cold tonight, with dense fog and some frost for a time especially in midland, northern and eastern areas with overnight lows of -1° to +3°.
James Madden, a forecaster for Exacta Weather, warned that snow will hit "northern and western areas" next week.
Lightning may also affect areas within the warning zone, which covers both Dundee and Perth.
'Westerly winds will clash with colder air to deliver widespread and heavy snow showers across some large swathes of the country.
The fog is expected to clear more in coastal counties as the day goes on, but several of these counties will still be subject to the Status Yellow warning due to heavy rainfall.
Mr Wilson said: "There is a lot of radiation fog around at the moment".
"Slower journey times are possible and there is a chance of delays to flights".
"This reduces the ability of the air to hold moisture, allowing condensation and fog to occur".
Britain is wrapping up for another chilly night with temperatures expected to drop to freezing widely with lows of -2C (28.4F) or -3C (26.6F) in rural regions.
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".